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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/18325

Title: Dirac fermion time-Floquet crystal: manipulating Dirac points
Authors: Rodriguez-Lopez, Pablo
Betouras, Joseph J.
Savel'ev, Sergey
Issue Date: 2014
Publisher: © American Physical Society
Citation: 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, 155132
Abstract: We 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.
Description: 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.89.155132
Sponsor: 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.
Version: Accepted for publication
DOI: 10.1103/PhysRevB.89.155132
URI: https://dspace.lboro.ac.uk/2134/18325
Publisher Link: http://dx.doi.org/10.1103/PhysRevB.89.155132
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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