Fig. 1 Microscopic interpretation of SC and CC using a two-band model.

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Presentation transcript:

Fig. 1 Microscopic interpretation of SC and CC using a two-band model. Microscopic interpretation of SC and CC using a two-band model. δ⟨ra⟩ is the variation of the mean value of position operator indicating the shift of electron wave packet in real space. Photoexcitation induces the shift of the electron wave packet in real space. SC comes from the displacement of wave packet upon photoabsorption, while CC stems from the asymmetric motion of electrons and holes and the self-rotation of the wave packet. The latter induces itinerant orbital magnetic momentum coupled with the circularly polarized light. Transition rate W of SC is proportional to the linear optical absorption strength under the linearly polarized light at frequency ω, while transition rate F of CC is proportional to the local Berry curvature under the circularly polarized light at frequency ω. Hua Wang, and Xiaofeng Qian Sci Adv 2019;5:eaav9743 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).