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Published August 30, 2013 | Submitted + Published
Journal Article Open

Photocurrent response of topological insulator surface states

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.

Additional Information

© 2013 American Physical Society. Received 12 March 2013; published 30 August 2013. We thank D. Hsieh for discussions and acknowledge financial support through the Helmholtz Virtual Institute "New States of Matter and Their Excitations" (Berlin) as well as DARPA, the IQIM, an NSF institute supported by the Moore Foundation, and the Humboldt Foundation (Pasadena).

Attached Files

Published - PhysRevB.88.075144.pdf

Submitted - 1301.4392v1.pdf

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August 19, 2023
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