Artículo
Irradiated graphene as a tunable Floquet topological insulator
Usaj, Gonzalo
; Pérez Piskunow, Pablo Matías
; Foa Torres, Luis Eduardo Francisco
; Balseiro, Carlos Antonio
Fecha de publicación:
09/2014
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter and Materials Physics
ISSN:
1098-0121
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In the presence of a circularly polarized mid-infrared radiation graphene develops dynamical band gaps in itsquasi-energy band structure and becomes a Floquet insulator. Here we analyze how topologically protected edgestates arise inside these gaps in the presence of an edge. Our results show that the gap appearing at̵hΩ~2, where̵hΩis the photon energy, is bridged by two chiral edge states whose propagation direction is set by the directionof the polarization of the radiation field. Therefore, both the propagation direction and the energy window wherethe states appear can be controlled externally. We present both analytical and numerical calculations that fullycharacterize these states. This is complemented by simple topological arguments that account for them and bynumerical calculations for the case of semi-infinite sample, thereby eliminating finite size effects.
Palabras clave:
Graphene
,
Topological Insulators
,
Chern Numbers
,
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Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Balseiro, Carlos Antonio; Foa Torres, Luis Eduardo Francisco; Pérez Piskunow, Pablo Matías; Usaj, Gonzalo; Irradiated graphene as a tunable Floquet topological insulator; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 90; 11; 9-2014; 1-13
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