Dynamical quantum anomalous Hall effect in the intense optical field regime (Conference Presentation)

Wang-Kong Tse

doi:10.1117/12.2275968

29 September 2017 Dynamical quantum anomalous Hall effect in the intense optical field regime (Conference Presentation)

Wang-Kong Tse

Proceedings Volume 10357, Spintronics X; 103570Y (2017) https://doi.org/10.1117/12.2275968
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

Wang-Kong Tse "Dynamical quantum anomalous Hall effect in the intense optical field regime (Conference Presentation)", Proc. SPIE 10357, Spintronics X, 103570Y (29 September 2017); https://doi.org/10.1117/12.2275968

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