https://doi.org/10.1140/epjb/e2019-90668-x
Regular Article
Manipulating the anisotropy of the Dirac-Cone in graphene by laser fields
1
Microsystems and Terahertz Research Center,
Chengdu,
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
a e-mail: Sh.a.f@outlook.com
b e-mail: F.Kusmartsev@lboro.ac.uk
c e-mail: S.Saveliev@lboro.ac.uk
Received:
13
November
2018
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
© The Author(s) 2019. This article is published with open access at Springerlink.com
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
