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Strongly anisotropic Dirac quasiparticles in irradiated graphene

S. V. Syzranov, Ya. I. Rodionov, K. I. Kugel, and F. Nori
Phys. Rev. B 88, 241112(R) – Published 30 December 2013
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Abstract

We study quasiparticle dynamics in graphene exposed to a linearly polarized electromagnetic wave of very large intensity. We demonstrate that low-energy transport in such system can be described by an effective time-independent Hamiltonian, characterized by multiple Dirac points in the first Brillouin zone. Around each Dirac point the spectrum is anisotropic: the velocity along the polarization of the radiation significantly exceeds the velocity in the perpendicular direction. Moreover, in some of the points the transverse velocity oscillates as a function of the radiation intensity. We find that the conductance of a graphene p-n junction in the regime of strong irradiation depends on the polarization as G(θ)|sinθ|3/2, where θ is the angle between the polarization and the p-n interface, and oscillates as a function of the radiation intensity.

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  • Received 7 October 2013

DOI:https://doi.org/10.1103/PhysRevB.88.241112

©2013 American Physical Society

Authors & Affiliations

S. V. Syzranov1,2, Ya. I. Rodionov3, K. I. Kugel3,4, and F. Nori4,5

  • 1Institute for Theoretical Condensed Matter Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
  • 2Physics Department, University of Colorado, Boulder, Colorado 80309, USA
  • 3Institute for Theoretical and Applied Electrodynamics, RAS, 125412 Moscow, Russia
  • 4Center of Emergent Matter Science, RIKEN, Saitama 351-0198, Japan
  • 5Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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Issue

Vol. 88, Iss. 24 — 15 December 2013

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