Anomalous Magneto-Optical Response and Chiral Interface of Dipolar Excitons at Twisted Valleys,Nano Letters

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Anomalous Magneto-Optical Response and Chiral Interface of Dipolar Excitons at Twisted Valleys
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-17 , DOI: 10.1021/acs.nanolett.2c01508
Huiyuan Zheng _{1,

2} , Dawei Zhai _{1,

2} , Wang Yao _{1,

2}

Affiliation

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.

中文翻译：

扭曲谷处偶极激子的异常磁光响应和手征界面

在扭曲的双层过渡金属二硫属化物中发现了偶极谷激子的异常磁光光谱，其中面内磁场在光锥内引起相当大的激子态多重分裂。分裂分支的手性色散使得单向激子电流的有效光学注入成为可能。我们还发现了一种用适度的异质应变代替磁场的模拟效应，用于在光锥中引入大的分裂和手性色散。光注入激子流的角取向可以通过应变控制，左右单向性通过圆极化选择。

更新日期：2022-06-17

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