Wednesday, April 24, 2013

1304.6272 (Pierre Delplace et al.)

Merging of Dirac points and Floquet topological transitions in AC driven
graphene
   [PDF]

Pierre Delplace, Álvaro Gómez-León, Gloria Platero
In the last years, the search for new topological phases in condensed matter systems has become a priority. In particular, their control by external means is still an important challenge from both fundamental and technological point of view. On the other hand, graphene, because of its striking electronic band structure, is an excellent platform to explore such phases. In particular, the manipulation of its band structure is an important issue. We demonstrate that driving graphene with an in-plane ac electric field allows for tuning the band structure and then induce out-of-equilibrium semi-metallic and insulating phases with distinct topological properties. In particular, suitable drivings offer the possibility to move and merge the Dirac points of graphene -- a topological transition which has not been observed yet in electronic systems -- but also to localize the electrons in specific directions, or even to increase the number of Dirac points.
View original: http://arxiv.org/abs/1304.6272

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