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Proceedings Paper

Dynamical quantum anomalous Hall effect in the intense optical field regime (Conference Presentation)
Author(s): Wang-Kong Tse
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Paper Abstract

Topological insulators are characterized by the quantum anomalous Hall effect on the topological surface states under time-reversal symmetry breaking. While this effect has been recently observed in a magneto-optical setup upon illumination of weak linearly polarized light, the influence of intense optical field remains largely unexplored. Using the Keldysh-Floquet Green's function formalism, we develop a theory for the dynamical Hall conductivity for arbitrary incident optical frequency in the intense optical field regime. We apply our general theory to the adiabatic, low-frequency regime, and study the breakdown of the one-half Hall quantization under intense optical field. Our results reveal a strong nonlinear dependence of the dynamical Hall conductivity on the incident optical field, which is triggered by the formation of Floquet subbands and the transitions between them.

Paper Details

Date Published: 29 September 2017
Proc. SPIE 10357, Spintronics X, 103570Y (29 September 2017); doi: 10.1117/12.2275968
Show Author Affiliations
Wang-Kong Tse, The Univ. of Alabama (United States)

Published in SPIE Proceedings Vol. 10357:
Spintronics X
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi; Henri Jaffrès, Editor(s)

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