Manipulating the anisotropy of the Dirac-Cone in graphene by laser fields
Microsystems and Terahertz Research Center,
Sichuan 610200, P.R. China
2 Department of Physics, Loughborough University, Loughborough LE11 3TU, UK
3 Department of Physics, University of Tabuk, Tabuk 71491, Saudi Arabia
4 ITMO University, St. Petersburg 197101, Russia
Received in final form: 10 February 2019
Published online: 15 April 2019
One of the most striking properties of graphene is the relativistic-like Dirac-Cone spectrum of charge carriers. By applying high-frequency laser fields, the system can be described with the use of similar spectrum which is based on a concept of electron quasi-energy. There in this spectrum a creation and annihilation of new Dirac points and cones as well as opening a gap may arise. This allows controlling electron motion without applying DC periodic fields which are effectively described by graphene superlattices. Here we demonstrate that coherent electromagnetic fields applied to graphene can generate new Dirac and Weyl points, induce Lifshitz quantum phase transition for slightly doped graphene and produce an anisotropy of the Dirac cones, which can be even infinite.
Key words: Solid State and Materials
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