Coherent magneto-optical effects in topological insulators: Excitation near the absorption edge

Wang-Kong Tse
Phys. Rev. B 94, 125430 – Published 21 September 2016

Abstract

We study coherent optics in topological insulator surface states with broken time-reversal symmetry and develop a theory for the dynamical Hall effect driven by an intense electromagnetic field. The influence of the optical Stark effect enters as a nonlinear dependence on the optical field in the resulting Faraday θF and Kerr θK rotations. This nonlinear correction is found to decrease θF with the strength of the a.c. electric field, whereas θK exhibits a nonmonotonic behavior. We also discuss the effects of relaxation and dephasing on the Hall and magneto-optical responses when the frequency detuning is comparable to the inverse lifetime of the conduction electrons.

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  • Received 26 May 2016
  • Revised 17 July 2016

DOI:https://doi.org/10.1103/PhysRevB.94.125430

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Wang-Kong Tse

  • Department of Physics and Astronomy, Center for Materials for Information Technology, The University of Alabama, Alabama 35487, USA

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Issue

Vol. 94, Iss. 12 — 15 September 2016

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