Publications

@article{nokey,

title = {A non-Hermitian loop for a quantum measurement},

author = {L. E. F. {Foa Torres} and S. Roche},

url = {https://arxiv.org/abs/2408.04629},

year  = {2024},

date = {2024-08-08},

keywords = {},

pubstate = {forthcoming},

tppubtype = {article}

}

@article{nokey,

title = {Non-Reciprocal Coupling in Photonics},

author = {R. A. Vicencio and D. Rom\'{a}n-Cort\'{e}s and M. Rubio-Sald\'{i}as and P. Vildoso and L. E. F. {Foa Torres}},

url = {https://arxiv.org/abs/2407.18174},

year  = {2024},

date = {2024-07-25},

keywords = {},

pubstate = {forthcoming},

tppubtype = {article}

}

@article{nokey,

title = {Breaking of Lorentz invariance caused by the interplay between spin-orbit interaction and transverse phonon modes in quantum wires},

author = {D. V. Efremov and W. Ccuiro and L. E. F. {Foa Torres} and M. N. Kiselev},

url = {https://arxiv.org/abs/2407.08613},

year  = {2024},

date = {2024-07-11},

urldate = {2024-07-11},

keywords = {},

pubstate = {forthcoming},

tppubtype = {article}

}

@article{nokey,

title = {Wavefunction collapse driven by non-Hermitian disturbance},

author = {J. Mart\'{i}nez Romeral and L. E. F. {Foa Torres} and S Roche},

doi = {10.1088/2399-6528/ad5b37},

year  = {2024},

date = {2024-07-02},

urldate = {2024-07-02},

journal = {Journal of Physics Communications},

volume = {8},

pages = {071001},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Transport of non-classical light mediated by topological domain walls in a SSH photonic lattice},

author = {G. O’Ryan P\'{e}rez and J. Medina Due\~{n}as and D. Guzm\'{a}n-Silva and L. E. F. {Foa Torres} and C. Hermann-Avigliano},

doi = {10.1038/s41598-024-63321-3},

year  = {2024},

date = {2024-05-30},

journal = {Scientific Reports},

volume = {14},

pages = {12435},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Topological phases of commensurate or incommensurate non-Hermitian Su-Schrieffer-Heeger lattices},

author = {M. Jangjan and L. Li and L. E. F. {Foa Torres} and M. V. Hosseini},

doi = {10.1103/PhysRevB.109.205142},

year  = {2024},

date = {2024-05-21},

urldate = {2024-05-21},

journal = {Physical Review B},

volume = {109},

pages = {205142},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Chiral magnon-polaron edge states in Heisenberg-Kitaev magnets},

author = {J. D. Mella and L. E. F. {Foa Torres} and R. E. Troncoso},

url = {https://arxiv.org/abs/2405.18644},

year  = {2024},

date = {2024-05-08},

keywords = {},

pubstate = {forthcoming},

tppubtype = {article}

}

@article{nokey,

title = {Floquet Engineering of a Diatomic Molecule Through a Bichromatic Radiation Field},

author = {E. Barriga and L. E. F. {Foa Torres} and C. Cardenas},

url = {https://arxiv.org/abs/2311.13697},

doi = {10.1021/acs.jctc.3c01277},

year  = {2024},

date = {2024-03-13},

urldate = {2023-11-22},

journal = {Journal of Chemical Theory and Computation },

volume = {20},

pages = {2559},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Entangled States Induced by Electron\textendashPhonon Interaction in Two-Dimensional Materials},

author = {J. D. {Mella} and H. L. Calvo and L. E. F. {Foa Torres}},

url = {https://doi.org/10.1021/acs.nanolett.3c03316},

doi = {10.1021/acs.nanolett.3c03316},

year  = {2023},

date = {2023-11-20},

journal = {Nano Letters},

volume = {23},

pages = {11013},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Floquet topological phase transitions in a periodically quenched dimer},

author = {M. Jangjan and L. E. F. {Foa Torres} and M. V. Hosseini},

url = {https://doi.org/10.1103/PhysRevB.106.224306},

doi = {10.1103/PhysRevB.106.224306},

year  = {2022},

date = {2022-12-10},

urldate = {2022-12-10},

journal = {Physical Review B},

volume = {102},

pages = {224306},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{caceres-aravena2022,

title = {Experimental observation of edge states in SSH-Stub photonic lattices},

author = {G. C\'{a}ceres-Aravena and B. Real and D. Guzm\'{a}n-Silva, and A. Amo and L. E. F. {Foa Torres} and R. A. Vicencio},

url = {https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.4.013185},

doi = {10.1103/PhysRevResearch.4.013185},

year  = {2022},

date = {2022-03-07},

journal = {Physical Review Research},

volume = {4},

number = {013185},

abstract = {We reveal unconventional edge states in a one-dimensional Stub lattice of coupled waveguides with staggered hoppings. The edge states appear for the same values of hoppings as topological edge states in the Su-Schrieffer-Heeger model. They have different energies depending on the lattice termination and present a remarkable robustness against certain types of disorder. We evidence experimentally the phase transition at which these edge states appear, opening the door to the engineering of one-dimensional lattices with localized edge modes whose energy and location can be controlled at will.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{medina-duenas2022,

title = {Copropagating edge states produced by the interaction between electrons and chiral phonons in two-dimensional materials},

author = {J. {Medina Due\~{n}as} and H. L. Calvo and L. E. F. {Foa Torres}},

url = {https://arxiv.org/abs/2109.03815},

doi = {https://doi.org/10.1103/PhysRevLett.128.066801},

year  = {2022},

date = {2022-02-07},

journal = {Physical Review Letters},

volume = {128},

pages = {066801},

abstract = {Unlike the chirality of electrons, the intrinsic chirality of phonons has only surfaced in recent years. Here, we report on the effects of the interaction between electrons and chiral phonons in two-dimensional materials by using a nonperturbative solution. We show that chiral phonons introduce inelastic Umklapp processes resulting in copropagating edge states that coexist with a continuum. Transport simulations further reveal the robustness of the edge states. Our results hint on the possibility of having a metal embedded with hybrid electron-phonon states of matter.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{mella2021,

title = {Robustness of spin-polarized edge states in a two-dimensional topological semimetal without inversion symmetry},

author = {J. Mella and L. E. F. {Foa Torres}},

url = {https://arxiv.org/abs/2107.12956},

doi = {https://doi.org/10.1103/PhysRevB.105.075403},

year  = {2022},

date = {2022-01-27},

journal = {Physical Review B},

volume = {105},

pages = {075403},

abstract = {Three-dimensional topological gapless phases have attracted significant attention due to their unique electronic properties. One of the flagships is the Weyl semimetals, which requires breaking time-reversal or inversion symmetry in three dimensions. In two dimensions, the dimensionality reduction requires imposing an additional symmetry, thereby weakening the phase. Like its three-dimensional counterpart, these two-dimensional Weyl semimetals present edge states directly related to Weyl nodes. The direct comparison with the edge states in zigzag-like terminated graphene ribbons is unavoidable, offering the question of how robust these states are and their differences. Here we benchmark the robustness of the edge states in two-dimensional Weyl semimetals with those present in zigzag graphene ribbons. To such end, we use a Dirac Hamiltonian model proposed by Young and Kane, adding new terms for inducing a two-dimensional Weyl semimetal phase and use a scattering picture for the transport calculation. Our results show that despite having a similar electronic band structure, the edge states of two-dimensional Weyl semimetal are more robust against vacancies than graphene ribbons. We attribute this enhanced robustness to a crucial role of the spin degree of freedom in the former case.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{foatorres_2021_valley,

title = {A valley of opportunities},

author = {L. E. F. {Foa Torres} and S. O. Valenzuela},

url = {https://t.co/ybNNHDPFUF},

doi = {https://doi.org/10.1088/2058-7058/34/11/40},

issn = {2058-7058},

year  = {2021},

date = {2021-11-01},

journal = {Physics World},

volume = {11},

pages = {43},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{medina-duenas2021,

title = {Quadrature protection of squeezed states in a one-dimensional topological insulator},

author = {J. {Medina Duenas} and G. O'{Ryan P\'{e}rez} and Carla Hermann-Avigliano and L. E. F. {Foa Torres}},

url = {https://arxiv.org/abs/2106.00869},

doi = {10.22331/q-2021-08-17-526},

year  = {2021},

date = {2021-08-17},

journal = {Quantum},

volume = {5},

pages = {526},

abstract = {What is the role of topology in the propagation of quantum light in photonic lattices? We address this question by studying the propagation of squeezed states in a topological one-dimensional waveguide array, benchmarking our results with those for a topologically trivial localized state, and studying their robustness against disorder. Specifically, we study photon statistics, one-mode and two-mode squeezing, and entanglement generation when the localized state is excited with squeezed light. These quantum properties inherit the shape of the localized state but, more interestingly, and unlike in the topologically trivial case, we find that propagation of squeezed light in a topologically protected state robustly preserves the phase of the squeezed quadrature as the system evolves. We show how this latter topological advantage can be harnessed for quantum information protocols.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{berdakin2020,

title = {Spin-polarized tunable photocurrents},

author = {M Berdakin and Esteban A Rodriguez-Mena and L. E. F. {Foa Torres}},

url = {https://arxiv.org/abs/2010.11883},

doi = {https://doi.org/10.1021/acs.nanolett.1c00420},

year  = {2021},

date = {2021-04-05},

journal = {Nano Letters},

volume = {21},

pages = {3177},

abstract = {Harnessing the unique features of topological materials for the development of a new generation of topological based devices is a challenge of paramount importance. Using Floquet scattering theory combined with atomistic models we study the interplay between laser illumination, spin and topology in a two-dimensional material with spin-orbit coupling. Starting from a topological phase, we show how laser illumination can selectively disrupt the topological edge states depending on their spin. This is manifested by the generation of pure spin currents and spin-polarized charge photocurrents under linearly and circularly polarized laser-illumination, respectively. Our results open a path for the generation and control of spin-polarized photocurrents.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{huaman2021,

title = {Quantum Hall edge states under periodic driving: A Floquet induced chirality switch},

author = {A. Huam\'{a}n and L. E. F. {Foa Torres} and C. A. Balseiro and Gonzalo Usaj},

url = {https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.3.013201},

doi = {10.1103/PhysRevResearch.3.013201},

year  = {2021},

date = {2021-03-04},

journal = {Physical Review Research},

volume = {3},

pages = {013201},

abstract = {We report on the fate of the quantum Hall effect in graphene under intense laser illumination. By using Floquet theory combined with both a low energy description and full tight-binding models, we clarify the selection rules, the quasienergy band structure, as well as their connection with the two-terminal and multiterminal conductance in a device setup as relevant for experiments. We show that the well-known dynamical gaps that appear in the Floquet spectrum at ±ℏΩ/2 lead to a switch-off of the quantum Hall edge transport for different edge terminations except for the armchair one, where two terms cancel out exactly. More interestingly, we show that near the Dirac point changing the laser polarization (circular right or circular left) controls the Hall conductance, by allowing to switch it on or off, or even by flipping its sign, thereby reversing the chirality of the edge states. This might lead to new avenues to fully control topologically protected transport.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{10.1088/2515-7639/abb74e,

title = {The 2021 Quantum Materials Roadmap},

author = {Feliciano Giustino and Manuel Bibes and Jin Hong Lee and Felix Trier and Roser Valent\'{i} and Stephen M Winter and Young-Woo Son and Louis Taillefer and Christoph Heil and Adriana I Figueroa and Bernard Pla\c{c}ais and QuanSheng Wu and Oleg V Yazyev and Erik P A M Bakkers and Jesper Nygr{a}rd and Pol Forn-Diaz and Silvano de Franceschi and Luis E F {Foa Torres} and James McIver and Anshuman Kumar and Tony Low and Regina Galceran and Sergio Valenzuela and Marius Vasile Costache and Aur\'{e}lien Manchon and Eun-Ah Kim and Gabriel Ravanhani Schleder and Adalberto Fazzio and Stephan Roche},

url = {https://iopscience.iop.org/article/10.1088/2515-7639/abb74e},

year  = {2021},

date = {2021-01-19},

journal = {Journal of Physics: Materials},

volume = {3},

pages = {042006},

abstract = {In recent years, the notion of “Quantum Materials” has emerged as a powerful unifying concept across diverse fields of science and engineering, from condensed-matter and cold-atom physics to materials science and quantum computing. Beyond traditional quantum materials such as unconventional superconductors, heavy fermions, and multiferroics, the field has significantly expanded to encompass topological quantum matter, two-dimensional materials and their van der Waals heterostructures, Moir\'{e} materials, Floquet time crystals, as well as materials and devices for quantum computation with Majorana fermions. In this Roadmap collection we aim to capture a snapshot of the most recent developments in the field, and to identify outstanding challenges and emerging opportunities. The format of the Roadmap, whereby experts in each discipline share their viewpoint and articulate their vision for quantum materials, reflects the dynamic and multifaceted nature of this research area, and is meant to encourage exchanges and discussions across traditional disciplinary boundaries. It is our hope that this collective vision will contribute to sparking new fascinating questions and activities at the intersection of materials science, condensed matter physics, device engineering, and quantum information, and to shaping a clearer landscape of quantum materials science as a new frontier of interdisciplinary scientific inquiry.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{foa_torres_3dQHE,

title = {Digging into the 3D Quantum Hall Effect [Viewpoint]},

author = {L E F {Foa Torres}},

url = {https://physics.aps.org/articles/pdf/10.1103/Physics.13.170},

doi = {10.1103/Physics.13.170 },

year  = {2020},

date = {2020-11-09},

journal = {Physics},

volume = {13},

pages = {170},

abstract = {Theorists invoke electron-phonon interactions to explain the recent observation of the quantum Hall effect in a 3D electronic system.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000545539000011,

title = {Topological magnonics in the two-dimensional van der Waals magnet CrI3},

author = {Esteban Aguilera and R Jaeschke-Ubiergo and N Vidal-Silva and Luis E F {Foa Torres} and A S Nunez},

url = {https://arxiv.org/abs/2002.05266},

doi = {10.1103/PhysRevB.102.024409},

issn = {2469-9950},

year  = {2020},

date = {2020-07-01},

journal = {Physical Review B},

volume = {102},

number = {2},

pages = {024409},

abstract = {We report on the magnon spectrum of Kitaev-Heisenberg magnets and 

 extract the parameters to model a two-dimensional CrI3. Our minimal spin 

 Hamiltonian includes a contribution stemming from a Heisenberg, 

 isotropic exchange, and a contribution arising from a Kitaev 

 interaction, anisotropic and frustrated exchange. Our calculations 

 reveal a gap that opens at the K and K' points and the topological 

 nature of the magnons which lead to the thermal Hall effect. 

 Furthermore, we calculate the magnon spectrum of nanoribbons 

 illustrating the corresponding edge states.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000514315800004,

title = {Floquet boundary states in AB-stacked graphite},

author = {Hernan L Calvo and Jose E Barrios Vargas and Luis E F {Foa Torres}},

url = {https://arxiv.org/abs/1911.02144},

doi = {10.1103/PhysRevB.101.075424},

issn = {2469-9950},

year  = {2020},

date = {2020-02-01},

journal = {Physical Review B},

volume = {101},

number = {7},

pages = {075424},

abstract = {We report on the effect of laser illumination with circularly polarized 

 light on the electronic structure of AB-stacked graphite samples. By 

 using Floquet theory in combination with Green's function techniques, we 

 find that the polarized light induces band-gap openings at the Floquet 

 zone edge h Omega/2, bridged by chiral boundary states. These states 

 propagate mainly along the borders of the constituting layers as 

 evidenced by the time-averaged local density of states and the 

 probability current density in several geometries. Semianalytic 

 calculations of the Chern number suggest that these states are of 

 topological nature, similar to those found in illuminated 2D samples 

 like monolayer and bilayer graphene. These states are promising 

 candidates for the realization of a three-dimensional version of the 

 quantum Hall effect for Floquet systems.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{caceres-aravena_topological_2020,

title = {Topological and flat-band states induced by hybridized linear interactions in one-dimensional photonic lattices},

author = { G. C\'{a}ceres-Aravena and L. E. F. {Foa Torres} and R. A. Vicencio},

url = {https://arxiv.org/abs/2004.11932},

doi = {10.1103/PhysRevA.102.023505},

year  = {2020},

date = {2020-01-01},

urldate = {2020-08-08},

journal = {Physical Review A},

volume = {102},

number = {2},

pages = {023505},

abstract = {We report on a study of a one-dimensional linear photonic lattice hosting, simultaneously, fundamental and dipolar modes at every site. We show how, thanks to the coupling between different orbital modes, this minimal model exhibits rich transport and topological properties. By varying the detuning coefficient we find a regime where bands become flatter (with reduced transport) and a second regime, where both bands connect at a gap-closing transition (with enhanced transport). We detect an asymmetric transport due to the asymmetric intermode coupling and a linear energy exchange mechanism between modes. Further analysis shows that the bands have a topological transition with a nontrivial Zak phase which leads to the appearance of edge states in a finite system. Finally, for zero detuning, we found a symmetric condition for coupling constants, where the linear spectrum becomes completely flat, with states fully localized in space occupying only two lattice sites.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000498851300011,

title = {Topological signatures in quantum transport in anomalous  Floquet-Anderson insulators},

author = {Esteban A Rodriguez-Mena and L E F {Foa Torres}},

url = {https://arxiv.org/abs/1909.05957},

doi = {10.1103/PhysRevB.100.195429},

issn = {2469-9950},

year  = {2019},

date = {2019-11-01},

journal = {Physical Review B},

volume = {100},

number = {19},

pages = {195429},

abstract = {Topological states require the presence of extended bulk states, as 

 usually found in the picture of energy bands and topological states 

 bridging the bulk gaps. But in driven systems this can be circumvented, 

 and one can get topological states coexisting with fully localized bulk 

 states, as in the case of the anomalous Floquet-Anderson insulator. 

 Here, we show the fingerprints of this peculiar topological phase in the 

 transport properties and their dependence on the disorder strength, 

 geometrical configuration (two-terminal and multiterminal setups), and 

 details of the driving protocol.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000488590700009,

title = {A sudden twist},

author = {Luis E F {Foa Torres}},

url = {https://rdcu.be/bJgEY},

doi = {10.1038/s41567-019-0595-4},

issn = {1745-2473},

year  = {2019},

date = {2019-10-01},

journal = {Nature Physics},

volume = {15},

number = {10},

pages = {988-989},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{torres_perspective_2019,

title = {Perspective on topological states of non-Hermitian lattices},

author = {Luis E F {Foa Torres}},

url = {https://doi.org/10.1088%2F2515-7639%2Fab4092},

doi = {10.1088/2515-7639/ab4092},

issn = {2515-7639},

year  = {2019},

date = {2019-01-01},

urldate = {2020-08-08},

journal = {Journal of Physics: Materials},

volume = {3},

number = {1},

pages = {014002},

abstract = {The search of topological states in non-Hermitian systems has gained a strong momentum over the last two years climbing to the level of an emergent research front. In this perspective we give an overview with a focus on connecting this topic to others like Floquet systems. Furthermore, using a simple scattering picture we discuss an interpretation of concepts like the Hamiltonian’s defectiveness, i.e. the lack of a full basis of eigenstates, crucial in many discussions of topological phases of non-Hermitian Hamiltonians.},

note = {Invited article for Focus Issue on Topological Matter},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{bajpai_spatio-temporal_2019,

title = {Spatio-temporal dynamics of shift current quantum pumping by femtosecond light pulse},

author = {U Bajpai and B S Popescu and P Plech\'{a}\v{c} and B K Nikoli\'{c} and L E F {Foa Torres} and H Ishizuka and N Nagaosa},

url = {https://arxiv.org/abs/1803.04404},

doi = {10.1088/2515-7639/ab0a3e},

issn = {2515-7639},

year  = {2019},

date = {2019-01-01},

urldate = {2020-08-08},

journal = {Journal of Physics: Materials},

volume = {2},

number = {2},

pages = {025004},

abstract = {Shift current\textemdasha photocurrent induced by light irradiating noncentrosymmetric materials in the absence of any bias voltage or built-in electric field\textemdashis one of the mechanisms of the so-called bulk photovoltaic effect. It has been traditionally described as a nonlinear optical response of a periodic solid to continuous wave light using a perturbative formula, which is linear in the intensity of light and which involves Berry connection describing the shift in the center of mass position of the Wannier wave function associated with the transition between the valence and conduction bands of the solid. Since shift current is solely due to off-diagonal elements of the nonequilibrium density matrix that encode quantum correlations, its peculiar space\textendashtime dynamics in response to femtosecond light pulse employed locally can be expected. To study such response requires to analyze realistic two-terminal devices, instead of traditional periodic solids, for which we choose paradigmatic Rice\textendashMele model sandwiched between two metallic electrodes and apply to it time-dependent nonequilibrium Green function algorithms scaling linearly in the number of time steps and capable of treating nonperturbative effects in the amplitude of external time-dependent fields. This reveals novel features: superballistic transport, signified by time dependence of the displacement of the photoexcited charge carriers from the spot where the femtosecond light pulse is applied toward the electrodes; and photocurrent quadratic in light intensity at subgap frequencies of light due to two-photon absorption processes that were missed in previous perturbative analyses. Furthermore, frequency dependence of the DC component of the photocurrent reveals shift current as a realization of nonadiabatic quantum charge pumping enabled by breaking of left\textendashright symmetry of the device structure. This demonstrates that a much wider class of systems, than the usually considered polar noncentrosymmetric bulk materials, can be exploited to generate nonzero DC component of photocurrent in response to unpolarized light and optimize shift-current-based solar cells and optoelectronic devices.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000451089900033,

title = {Directional control of charge and valley currents in a graphene-based  device},

author = {M Berdakin and J E Barrios Vargas and L E F {Foa Torres}},

url = {https://chemrxiv.org/engage/chemrxiv/article-details/60c73f3f337d6cce34e264e7},

doi = {10.1039/c8cp04878a},

issn = {1463-9076},

year  = {2018},

date = {2018-12-01},

journal = {Physical Chemistry Chemical Physics},

volume = {20},

number = {45},

pages = {28720-28725},

abstract = {We propose a directional switching effect in a metallic device. To this 

 end we exploit a graphene-based device with a three-terminal geometry in 

 the presence of a magnetic field. We show that unidirectional charge and 

 valley currents can be controlled by the Fermi energy and the magnetic 

 field direction in the active device. Interestingly, unidirectional 

 transport of charges and valleys is generated between two-terminals at 

 the same bias voltage. Furthermore, we quantify the valley 

 depolarization as a function of disorder concentration. Our results open 

 a way for active graphene-based valleytronics devices.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000455553900002,

title = {Topological states of non-Hermitian systems},

author = {V M {Martinez Alvarez} and J E {Barrios Vargas} and M Berdakin and L E F {Foa Torres}},

url = {https://repositorio.uchile.cl/bitstream/handle/2250/169477/Topological_states.pdf?sequence=1\&isAllowed=y},

doi = {10.1140/epjst/e2018-800091-5},

issn = {1951-6355},

year  = {2018},

date = {2018-12-01},

journal = {European Physical Journal-Special Topics},

volume = {227},

number = {12},

pages = {1295-1308},

abstract = {Recently, the search for topological states of matter has turned to 

 non-Hermitian systems, which exhibit a rich variety of unique properties 

 without Hermitian counterparts. Lattices modeled through non-Hermitian 

 Hamiltonians appear in the context of photonic systems, where one needs 

 to account for gain and loss, circuits of resonators, and also when 

 modeling the lifetime due to interactions in condensed matter systems. 

 Here we provide a brief overview of this rapidly growing subject, the 

 search for topological states and a bulk-boundary correspondence in 

 non-Hermitian systems.},

note = {Invited short review for the special issue “Topological States of Matter: Theory and Applications”},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000438855600002,

title = {Robust edge states induced by electron-phonon interaction in graphene  nanoribbons},

author = {Hernan L Calvo and Javier S Luna and Virginia {Dal Lago} and Luis E F {Foa Torres}},

url = {https://arxiv.org/abs/1805.00576},

doi = {10.1103/PhysRevB.98.035423},

issn = {2469-9950},

year  = {2018},

date = {2018-07-01},

journal = {Physical Review B},

volume = {98},

number = {3},

pages = {035423},

abstract = {The search of new means of generating and controlling topological states 

 of matter is at the front of many joint efforts, including band-gap 

 engineering by doping and light-induced topological states. Most of our 

 understading, however, is based on a single particle picture. 

 Topological states in systems including interaction effects, such as 

 electron-electron and electron-phonon, remain less explored. By 

 exploiting a nonperturbative and nonadiabatic picture, here we show how 

 the interaction between electrons and a coherent phonon mode can lead to 

 a band gap hosting edge states of topological origin. Further numerical 

 simulations witness the robustness of these states against different 

 types of disorder. Our results contribute to the search of topological 

 states, in this case in a minimal Fock space.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000427638900007,

title = {Multiterminal conductance at the surface of a Weyl semimetal},

author = {J {Chesta Lopez} and L E F {Foa Torres} and A S Nunez},

url = {https://repositorio.uchile.cl/bitstream/handle/2250/155800/item_85043982183.pdf?sequence=1\&isAllowed=y},

doi = {10.1103/PhysRevB.97.125419},

issn = {2469-9950},

year  = {2018},

date = {2018-03-01},

journal = {Physical Review B},

volume = {97},

number = {12},

pages = {125419},

abstract = {Weyl semimetals are a new paradigmatic topological phase of matter 

 featuring a gapless spectrum. One of its most distinctive features is 

 the presence of Fermi arc surface states. Here, we report on atomistic 

 simulations of the dc conductance and quantum Hall response of a 

 minimalWeyl semimetal. By using scattering theory we show that a 

 quantized Hall conductance with a nonvanishing longitudinal conductance 

 emerges associated to the Fermi arc surface states with a remarkable 

 robustness to high concentrations of defects in the system. 

 Additionally, we predict that a slab of a Weyl semimetal with broken 

 time-reversal symmetry bears persistent currents fully determined by the 

 system size and the lattice parameters.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000426779100002,

title = {Non-Hermitian robust edge states in one dimension: Anomalous  localization and eigenspace condensation at exceptional points},

author = {V M {Martinez Alvarez} and J E {Barrios Vargas} and L E F {Foa Torres}},

url = {https://repositorio.uchile.cl/bitstream/handle/2250/169335/Non_hermitian.pdf?sequence=1\&isAllowed=y},

doi = {10.1103/PhysRevB.97.121401},

issn = {2469-9950},

year  = {2018},

date = {2018-03-01},

journal = {Physical Review B},

volume = {97},

number = {12},

pages = {121401},

abstract = {Capital to topological insulators, the bulk-boundary correspondence ties 

 a topological invariant computed from the bulk (extended) states with 

 those at the boundary, which are hence robust to disorder. Here we put 

 forward a different ordering unique to non-Hermitian lattices whereby a 

 pristine system becomes devoid of extended states, a property which 

 turns out to be robust to disorder. This is enabled by a peculiar type 

 of non-Hermitian degeneracy where a macroscopic fraction of the states 

 coalesce at a single point with a geometrical multiplicity of 1.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000417487200003,

title = {One-way transport in laser-illuminated bilayer graphene: A Floquet  isolator},

author = {V {Dal Lago} and E Suarez Morell and L E F {Foa Torres}},

url = {https://repositorio.uchile.cl/bitstream/handle/2250/168735/One-way-transport.pdf?sequence=1\&isAllowed=y},

doi = {10.1103/PhysRevB.96.235409},

issn = {2469-9950},

year  = {2017},

date = {2017-12-01},

journal = {Physical Review B},

volume = {96},

number = {23},

pages = {235409},

abstract = {We explore the Floquet band structure and electronic transport in 

 laser-illuminated bilayer graphene ribbons. By using a bias voltage 

 perpendicular to the graphene bilayer we show how to get one-way charge 

 and valley transport among two unbiased leads. In contrast to quantum 

 pumping, our proposal uses a different mechanism based on generating a 

 nonreciprocal band structure with a built-in directionality. The Floquet 

 states at one edge of a graphene layer become hybridized with the 

 continuum on the other layer, so the resulting band structure allows for 

 one-way transport as in an isolator. Our proof of concept may serve as a 

 building block for devices exploiting one-way states.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000387051100002,

title = {Photoelectric polarization-sensitive broadband photoresponse from 

 interface junction states in graphene},

author = {Nikolai G Kalugin and Lei Jing and Eric Suarez Morell and Gregory C Dyer and Lee Wickey and Mekan Ovezmyradov and Albert D Grine and Michael C Wanke and Eric A Shaner and Chun Ning Lau and Luis E F Foa Torres and Mikhail V Fistul and Konstantin B Efetov},

doi = {10.1088/2053-1583/4/1/015002},

issn = {2053-1583},

year  = {2017},

date = {2017-03-01},

journal = {2D Materials},

volume = {4},

number = {1},

abstract = {Graphene has established itself as a promising optoelectronic material. 

 Many details of the photoresponse (PR) mechanisms in graphene in the 

 THz-to-visible range have been revealed, however, new intricacies 

 continue to emerge. Interface junctions, formed at the boundaries 

 between parts of graphene with different number of layers or different 

 stacking orders, and making connection between electrical contacts, 

 provide another peculiar setup to establish PR. Here, we experimentally 

 demonstrate an enhanced polarization sensitive photoelectric PR in 

 graphene sheets containing interface junctions as compared to homogenous 

 graphene sheets in the visible, infrared, and THz spectral regions. Our 

 numerical simulations show that highly localized electronic states are 

 created at the interface junctions, and these states exhibit a unique 

 energy spectrum and enhanced probabilities for optical transitions. The 

 interaction of electrons from interface junction states with 

 electromagnetic fields generates a polarization-sensitive PR that is 

 maximal for the polarization direction perpendicular to the junction 

 interface.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000385676900001,

title = {Valley filtering by a line-defect in graphene: quantum interference and  inversion of the filter effect},

author = {L H Ingaramo and L E F {Foa Torres}},

url = {https://arxiv.org/abs/1609.05769},

doi = {10.1088/0953-8984/28/48/485302},

issn = {0953-8984},

year  = {2016},

date = {2016-12-01},

journal = {Journal of Physics-Condensed Matter},

volume = {28},

number = {48},

pages = {485302},

abstract = {Valley filters are crucial to any device exploiting the valley degree of 

 freedom. By using an atomistic model, we analyze the mechanism leading 

 to the valley filtering produced by a line-defect in graphene and show 

 how it can be inverted by external means. Thanks to a mode decomposition 

 applied to a tight-binding model we can resolve the different transport 

 channels in k-space while keeping a simple but accurate description of 

 the band structure, both close and further away from the Dirac point. 

 This allows the understanding of a destructive interference effect, 

 specifically a Fano resonance or antiresonance located on the p-side of 

 the Dirac point leading to a reduced conductance. We show that in the 

 neighborhood of this feature the valley filtering can be reversed by 

 changing the occupations with a gate voltage, the mechanism is explained 

 in terms of a valley-dependent Fano resonance splitting. Our results 

 open the door for enhanced control of valley transport in graphene-based 

 devices.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000378816300004,

title = {Floquet bound states around defects and adatoms in graphene},

author = {D A Lovey and Gonzalo Usaj and L E F {Foa Torres} and C A Balseiro},

doi = {10.1103/PhysRevB.93.245434},

issn = {2469-9950},

year  = {2016},

date = {2016-06-01},

journal = {Physical Review B},

volume = {93},

number = {24},

pages = {245434},

abstract = {Recent studies have focused on laser-induced gaps in graphene which have 

 been shown to have a topological origin, thereby hosting robust states 

 at the sample edges. While the focus has remainedmainly on these 

 topological chiral edge states, the Floquet bound states around defects 

 lack a detailed study. In this paper we present such a study covering 

 large defects of different shape and also vacancy-like defects and 

 adatoms at the dynamical gap at h Omega/2 (h Omega being the photon 

 energy). Our results, based on analytical calculations as well as 

 numerics for full tight-binding models, show that the bound states are 

 chiral and appear in a number which grows with the defect size. 

 Furthermore, while the bound states exist regardless of the type of the 

 defect's edge termination (zigzag, armchair, mixed), the spectrum is 

 strongly dependent on it. In the case of top adatoms, the bound state 

 quasienergies depend on the adatoms energy. The appearance of such bound 

 states might open the door to the presence of topological effects on the 

 bulk transport properties of dirty graphene.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000370841200006,

title = {Crafting zero-bias one-way transport of charge and spin},

author = {L E F {Foa Torres} and V {Dal Lago} and E Suarez Morell},

url = {https://repositorio.uchile.cl/bitstream/handle/2250/139102/Crafting-zero-bias-one-way-transport-of-charge-and-spin.pdf?sequence=1\&isAllowed=y},

doi = {10.1103/PhysRevB.93.075438},

issn = {2469-9950},

year  = {2016},

date = {2016-02-01},

journal = {Physical Review B},

volume = {93},

number = {7},

pages = {075438},

abstract = {We explore the electronic structure and transport properties of a metal 

 on top of a (weakly coupled) two-dimensional topological insulator. 

 Unlike the widely studied junctions between topological nontrivial 

 Materials, the systems studied here allow for a unique band structure 

 and transport steering. First, states on the topological insulator layer 

 may coexist with the gapless bulk and, second, the edge states on one 

 edge can be selectively switched off, thereby leading to nearly perfect 

 directional transport of charge and spin even in the zero bias limit. We 

 illustrate these phenomena for Bernal stacked bilayer graphene with 

 Haldane or intrinsic spin-orbit terms and a perpendicular bias voltage. 

 This opens a path for realizing directed transport in Materials such as 

 van der Waals heterostructures, monolayer, and ultrathin topological 

 insulators.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000359672200007,

title = {Floquet topological transitions in a driven one-dimensional topological  insulator},

author = {V {Dal Lago} and M Atala and L E F {Foa Torres}},

doi = {10.1103/PhysRevA.92.023624},

issn = {1050-2947},

year  = {2015},

date = {2015-08-01},

journal = {Physical Review A},

volume = {92},

number = {2},

pages = {023624},

abstract = {The Su-Schrieffer-Heeger model of polyacetylene is a paradigmatic 

 Hamiltonian exhibiting nontrivial edge states. By using Floquet theory 

 we study how the spectrum of this one-dimensional topological insulator 

 is affected by a time-dependent potential. In particular, we provide 

 evidence of the competition among different photon-assisted processes 

 and the native topology of the unperturbed Hamiltonian to settle the 

 resulting topology at different driving frequencies. While some regions 

 of the quasienergy spectrum develop new gaps hosting Floquet edge 

 states, the native gap can be dramatically reduced and the original edge 

 states may be destroyed or replaced by new Floquet edge states. Our 

 study is complemented by an analysis of the Zak phase applied to the 

 Floquet bands. Besides serving as a simple example for understanding the 

 physics of driven topological phases, our results could find a promising 

 testing ground in cold-matter experiments.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000356129800001,

title = {Floquet interface states in illuminated three-dimensional topological  insulators},

author = {H L Calvo and L E F {Foa Torres} and P M Perez-Piskunow and C A Balseiro and Gonzalo Usaj},

doi = {10.1103/PhysRevB.91.241404},

issn = {2469-9950},

year  = {2015},

date = {2015-06-01},

journal = {Physical Review B},

volume = {91},

number = {24},

pages = {241404},

abstract = {Recent experiments showed that the surface of a three-dimensional 

 topological insulator develops gaps in the Floquet-Bloch band spectrum 

 when illuminated with a circularly polarized laser. These Floquet-Bloch 

 bands are characterized by nontrivial Chern numbers which only depend on 

 the helicity of the polarization of the radiation field. Here we propose 

 a setup consisting of a pair of counterrotating lasers, and show that 

 one-dimensional chiral states emerge at the interface between the two 

 lasers. These interface states turn out to be spin polarized and may 

 trigger interesting applications in the field of optoelectronics and 

 spintronics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000353121400005,

title = {Hierarchy of Floquet gaps and edge states for driven honeycomb lattices},

author = {P M Perez-Piskunow and L E F {Foa Torres} and Gonzalo Usaj},

doi = {10.1103/PhysRevA.91.043625},

issn = {1050-2947},

year  = {2015},

date = {2015-04-01},

journal = {Physical Review A},

volume = {91},

number = {4},

pages = {043625},

abstract = {Electromagnetic driving in a honeycomb lattice can induce gaps and 

 topological edge states with a structure of increasing complexity as the 

 frequency of the driving lowers. While the high-frequency case is the 

 most simple to analyze we focus on the multiple photon processes allowed 

 in the low-frequency regime to unveil the hierarchy of Floquet edge 

 states. In the case of low intensities an analytical approach allows us 

 to derive effective Hamiltonians and address the topological character 

 of each gap in a constructive manner. At high intensities we obtain the 

 net number of edge states, given by the winding number, with a numerical 

 calculation of the Chern numbers of each Floquet band. Using these 

 methods, we find a hierarchy that resembles that of a Russian nesting 

 doll. This hierarchy classifies the gaps and the associated edge states 

 in different orders according to the electron-photon coupling strength. 

 For large driving intensities, we rely on the numerical calculation of 

 the winding number, illustrated in a map of topological phase 

 transitions. The hierarchy unveiled with the low-energy effective 

 Hamiltonians, along with the map of topological phase transitions, 

 discloses the complexity of the Floquet band structure in the 

 low-frequency regime. The proposed method for obtaining the effective 

 Hamiltonian can be easily adapted to other Dirac Hamiltonians of 

 two-dimensional Materials and even the surface of a three-dimensional 

 topological insulator.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000351738400005,

title = {Line defects and quantum Hall plateaus in graphene},

author = {V {Dal Lago} and L E F {Foa Torres}},

doi = {10.1088/0953-8984/27/14/145303},

issn = {0953-8984},

year  = {2015},

date = {2015-04-01},

journal = {Journal of Physics-Condensed Matter},

volume = {27},

number = {14},

pages = {145303},

abstract = {Line defects in graphene can be either tailored-growth or arise 

 naturally and are at the center of many discussions. Here we study the 

 multiterminal conductance of graphene with an extended line defect in 

 the quantum Hall regime analyzing the effects of the geometry of the 

 setup, disorder and strain on the quantum Hall plateaus. We show that 

 the defect turns out to affect the local and non-local conductance in 

 very different ways depending on the geometrical configuration. When the 

 defect is parallel to the sample edges one gets an equivalent circuit 

 formed by parallel resistors. In contrast, when the defect bridges 

 opposite edges, the Hall conductance may remain unaltered depending on 

 the geometry of the voltage/current probes. The role of disorder, strain 

 and the microscopic details of the defect in our results is also 

 discussed. We show that the defect provides a realization of the 

 electrical analog of an optical beam splitter. Its peculiar energy 

 dependent inter-edge transmission allows it to be turned on or off at 

 will and it may be used for routing the chiral edge states.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000346836900008,

title = {Multiterminal Conductance of a Floquet Topological Insulator},

author = {L E F {Foa Torres} and P M Perez-Piskunow and C A Balseiro and Gonzalo Usaj},

url = {https://ri.conicet.gov.ar/bitstream/handle/11336/31800/CONICET_Digital_Nro.d43d95e3-2abd-4a55-a56b-8a48ac31e686_A.pdf?sequence=2\&isAllowed=y},

doi = {10.1103/PhysRevLett.113.266801},

issn = {0031-9007},

year  = {2014},

date = {2014-12-01},

journal = {Physical Review Letters},

volume = {113},

number = {26},

pages = {266801},

abstract = {We report on simulations of the dc conductance and quantum Hall response 

 of a Floquet topological insulator using Floquet scattering theory. Our 

 results reveal that laser-induced edge states lead to quantum Hall 

 plateaus once imperfect matching with the nonilluminated leads is 

 lessened. The magnitude of the Hall plateaus, however, is not directly 

 related to the number and chirality of all the edge states at a given 

 energy, as usual. Instead, the plateaus are dominated by those edge 

 states adding to the time-averaged density of states. Therefore, the dc 

 quantum Hall conductance of a Floquet topological insulator is not 

 directly linked to topological invariants of the full Floquet bands.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000342159000003,

title = {Irradiated graphene as a tunable Floquet topological insulator},

author = {Gonzalo Usaj and P M Perez-Piskunow and L E F {Foa Torres} and C A Balseiro},

url = {https://ri.conicet.gov.ar/bitstream/handle/11336/31852/CONICET_Digital_Nro.27f6decb-79ac-482b-bed6-a1656c3987a9_A.pdf?sequence=2\&isAllowed=y},

doi = {10.1103/PhysRevB.90.115423},

issn = {1098-0121},

year  = {2014},

date = {2014-09-01},

journal = {Physical Review B},

volume = {90},

number = {11},

pages = {115423},

abstract = {In the presence of a circularly polarized mid-infrared radiation 

 graphene develops dynamical band gaps in its quasienergy band structure 

 and becomes a Floquet insulator. Here, we analyze how topologically 

 protected edge states arise inside these gaps in the presence of an 

 edge. Our results show that the gap appearing at h Omega/2, where h 

 Omega is the photon energy, is bridged by two chiral edge states whose 

 propagation direction is set by the direction of the polarization of the 

 radiation field. Therefore, both the propagation direction and the 

 energy window where the states appear can be controlled externally. We 

 present both analytical and numerical calculations that fully 

 characterize these states. This is complemented by simple topological 

 arguments that account for them and by numerical calculations for the 

 case of the semi-infinite sample, thereby eliminating finite-size 

 effects.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000339368700041,

title = {On the Nature of Defects in Liquid-Phase Exfoliated Graphene},

author = {M V Bracamonte and G I Lacconi and S E Urreta and L E F {Foa Torres}},

doi = {10.1021/jp501930a},

issn = {1932-7447},

year  = {2014},

date = {2014-07-01},

journal = {Journal of Physical Chemistry C},

volume = {118},

number = {28},

pages = {15455-15459},

abstract = {Liquid-phase exfoliation is one of the most promising routes for 

 large-scale production of multilayer graphene dispersions. These 

 dispersions, which may be used in coatings, composites, or paints, are 

 believed to contain disorder-free graphene multilayers. Here, we address 

 the nature of defects in such samples obtained by liquid-phase 

 exfoliation of graphite powder in N-methyl-2-pyrrolidone. Our Raman 

 spectroscopy data challenge the assumption that these multilayers are 

 free of bulk defects, revealing that defect localization strongly 

 depends on the sonication time. For short ultrasound times, defects are 

 located mainly at the layer edges but they turn out to build up in the 

 bulk for ultrasonic times above 2 h. This knowledge may help to devise 

 better strategies to achieve high-quality graphene dispersions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000333901100090,

title = {Single-parameter spin-pumping in driven metallic rings with spin-orbit  coupling},

author = {J P Ramos and L E F {Foa Torres} and P A Orellana and V M Apel},

doi = {10.1063/1.4868902},

issn = {0021-8979},

year  = {2014},

date = {2014-03-01},

journal = {Journal of Applied Physics},

volume = {115},

number = {12},

pages = {124507},

abstract = {We consider the generation of a pure spin-current at zero bias voltage 

 with a single time-dependent potential. To such end we study a device 

 made of a mesoscopic ring connected to electrodes and clarify the 

 interplay between a magnetic flux, spin-orbit coupling, and 

 non-adiabatic driving in the production of a spin and electrical 

 current. By using Floquet theory, we show that the generated spin to 

 charge current ratio can be controlled by tuning the spin-orbit 

 coupling. (C) 2014 AIP Publishing LLC.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000332456000001,

title = {Floquet chiral edge states in graphene},

author = {P M Perez-Piskunow and Gonzalo Usaj and C A Balseiro and L E F Foa Torres},

url = {https://ri.conicet.gov.ar/bitstream/handle/11336/27548/CONICET_Digital_Nro.ad91487c-974f-44c4-a660-13f320b80798_A.pdf?sequence=2\&isAllowed=y},

doi = {10.1103/PhysRevB.89.121401},

issn = {1098-0121},

year  = {2014},

date = {2014-03-01},

journal = {Physical Review B},

volume = {89},

number = {12},

pages = {121401},

abstract = {We report on the emergence of laser-induced chiral edge states in 

 graphene ribbons. Insights on the nature of these Floquet states is 

 provided by an analytical solution which is complemented with numerical 

 simulations of the transport properties. Guided by these results we show 

 that graphene can be used for realizing nonequilibrium topological 

 states with striking tunability: while the laser intensity can be used 

 to control their velocity and decay length, changing the laser 

 polarization switches their propagation direction.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000324826000083,

title = {Quantum charge pumping in graphene-based devices: When lattice defects  do help},

author = {Lucas H Ingaramo and Luis E F {Foa Torres}},

doi = {10.1063/1.4821262},

issn = {0003-6951},

year  = {2013},

date = {2013-09-01},

journal = {Applied Physics Letters},

volume = {103},

number = {12},

pages = {123508},

abstract = {Quantum charge pumping, the quantum coherent generation of a dc current 

 at zero bias through time-dependent potentials, provides outstanding 

 opportunities for metrology and the development of nanodevices. The long 

 electronic coherence times and high quality of the crystal structure of 

 graphene may provide suitable building blocks for such quantum pumps. 

 Here, we focus in adiabatic quantum pumping through graphene nanoribbons 

 in the Fabry-Perot regime highlighting the crucial role of defects by 

 using atomistic simulations. We show that even a single defect added to 

 the pristine structure may produce a two orders of magnitude increase in 

 the pumped charge. (C) 2013 AIP Publishing LLC.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000316210200005,

title = {Non-perturbative effects of laser illumination on the electrical  properties of graphene nanoribbons},

author = {Hernan L Calvo and Pablo M Perez-Piskunow and Horacio M Pastawski and Stephan Roche and Luis E F {Foa Torres}},

doi = {10.1088/0953-8984/25/14/144202},

issn = {0953-8984},

year  = {2013},

date = {2013-04-01},

journal = {Journal of Physics-Condensed Matter},

volume = {25},

number = {14},

pages = {144202},

abstract = {Floquet theory combined with a realistic description of the electronic 

 structure of illuminated graphene and graphene nanoribbons is developed 

 to assess the emergent non-adiabatic and non-perturbative effects on the 

 electronic properties. Here we introduce an efficient computational 

 scheme and illustrate its use by applying it to graphene nanoribbons in 

 the presence of both linear and circular polarization. The interplay 

 between confinement due to the finite sample size and laser-induced 

 transitions is shown to lead to sharp features in the average 

 conductance and density of states. Particular emphasis is given to the 

 emergence of the bulk limit response.},

note = {Invited Article},

keywords = {},

pubstate = {published},

tppubtype = {article}

}