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Dirac fermion time-Floquet crystal: manipulating Dirac points
journal contribution
posted on 2015-07-24, 11:02 authored by Pablo Rodriguez-Lopez, Joseph BetourasJoseph Betouras, Sergey SavelievSergey SavelievWe demonstrate how to control the spectra and current flow of Dirac electrons in both a graphene sheet and a topological insulator (TI) by applying either two linearly polarized laser fields with frequencies ω and 2ω or a monochromatic (one-frequency) laser field together with a spatially periodic static potential (graphene/TI superlattice). Using the Floquet theory and the resonance approximation, we show that a Dirac point in the electron spectrum can be split into several Dirac points whose relative location in momentum space can be efficiently manipulated by changing the characteristics of the laser fields. In addition, the laser-field-controlled Dirac fermion band structure - a Dirac fermion time-Floquet crystal - allows the manipulation of the electron currents in graphene and topological insulators. Furthermore, the generation of dc currents of desirable intensity in a chosen direction occurs when the biharmonic laser field is applied, which can provide a straightforward experimental test of the predicted phenomena.
Funding
This work has been supported by the Engineering and Physical Sciences Research Council under the grant EP/H049797/1, the Leverhulme Trust and the project MOSAICO.
History
School
- Science
Department
- Physics
Published in
Physical Review B - Condensed Matter and Materials PhysicsVolume
89Issue
15Citation
RODRIGUEZ-LOPEZ, P., BETOURAS, J.J. and SAVEL'EV, S., 2014. Dirac fermion time-Floquet crystal: Manipulating Dirac points. Physical Review B - Condensed Matter and Materials Physics, 89, 155132Publisher
© American Physical SocietyVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2014Notes
This article was published in the journal, Physical Review B [© American Physical Society]. It is also available at: http://dx.doi.org/10.1103/PhysRevB.89.155132ISSN
1098-0121eISSN
1550-235XPublisher version
Language
- en