Irradiated graphene as a tunable Floquet topological insulator
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...
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Autores principales: | , , , |
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Formato: | article |
Lenguaje: | Inglés |
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2021
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Acceso en línea: | http://hdl.handle.net/11086/20395 https://doi.org/10.1103/PhysRevB.90.115423 |
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I10-R141-11086-20395 |
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institution |
Universidad Nacional de Córdoba |
institution_str |
I-10 |
repository_str |
R-141 |
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Repositorio Digital Universitario (UNC) |
language |
Inglés |
topic |
Graphene Topological insulators Chern numbers Floquet |
spellingShingle |
Graphene Topological insulators Chern numbers Floquet Usaj, Gonzalo Pérez Piskunow, Pablo Matías Foa Torres, Luis Eduardo Francisco Balseiro, Carlos A. Irradiated graphene as a tunable Floquet topological insulator |
topic_facet |
Graphene Topological insulators Chern numbers Floquet |
description |
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 hΩ/2, where hΩ 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. |
format |
article |
author |
Usaj, Gonzalo Pérez Piskunow, Pablo Matías Foa Torres, Luis Eduardo Francisco Balseiro, Carlos A. |
author_facet |
Usaj, Gonzalo Pérez Piskunow, Pablo Matías Foa Torres, Luis Eduardo Francisco Balseiro, Carlos A. |
author_sort |
Usaj, Gonzalo |
title |
Irradiated graphene as a tunable Floquet topological insulator |
title_short |
Irradiated graphene as a tunable Floquet topological insulator |
title_full |
Irradiated graphene as a tunable Floquet topological insulator |
title_fullStr |
Irradiated graphene as a tunable Floquet topological insulator |
title_full_unstemmed |
Irradiated graphene as a tunable Floquet topological insulator |
title_sort |
irradiated graphene as a tunable floquet topological insulator |
publishDate |
2021 |
url |
http://hdl.handle.net/11086/20395 https://doi.org/10.1103/PhysRevB.90.115423 |
work_keys_str_mv |
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bdutipo_str |
Repositorios |
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1764820391927218179 |