Photocurrent response of topological insulator surface states

Alexandra Junck, Gil Refael, and Felix von Oppen
Phys. Rev. B 88, 075144 – Published 30 August 2013

Abstract

We study the photocurrent response of topological insulator surface states to circularly polarized light for arbitrary oblique incidence. We describe the surface states within a Dirac model, including several perturbations such as hexagonal warping, nonlinear corrections to the mode velocity, and applied magnetic fields. We find that the photogalvanic current is strongly suppressed for the usual orbital coupling, prompting us to include the weaker Zeeman coupling. We find that the helicity-independent photocurrent dominates over the helicity-dependent contributions.

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  • Received 12 March 2013

DOI:https://doi.org/10.1103/PhysRevB.88.075144

©2013 American Physical Society

Authors & Affiliations

Alexandra Junck1, Gil Refael2,1, and Felix von Oppen1

  • 1Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
  • 2Department of Physics, California Institute of Technology, 1200 East California Boulevard, MC114-36, Pasadena, California 91125, USA

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Vol. 88, Iss. 7 — 15 August 2013

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