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Anomalous Magneto-Optical Response and Chiral Interface of Dipolar Excitons at Twisted Valleys
Huiyuan Zheng1,2, Dawei Zhai1,2, Wang Yao1,2
1Department of Physics, The University of Hong Kong, Hong Kong, China.
Abstract:
An anomalous magneto-optical spectrum is discovered for dipolar valley excitons in twisted double-layer transition metal dichalcogenides, where the in-plane magnetic field induces a sizable multiplet splitting of exciton states inside the light cone. Chiral dispersions of the split branches make possible an efficient optical injection of the unidirectional exciton current. We also find an analog effect with a modest heterostrain replacing the magnetic field for introducing large splitting and chiral dispersions in the light cone. Angular orientation of the photoinjected exciton flow can be controlled by strain, with left-right unidirectionality selected by circular polarization.
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