Affiliation:
1. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Department of Physics School of Science Tianjin University Tianjin 300354 China
2. Research Team of Extreme Condition Physics College of Physics and Electronic Information Inner Mongolia Minzu University Tongliao 028043 China
3. State Key Laboratory of Luminescence and Applications Changchun Institute of Optics, Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China
Abstract
The rotational dynamics of the intralayer and interlayer excitons with their inherent momenta of inertia in the monolayer and bilayer transition metal dichalcogenides, respectively, where the new chirality of exciton is endowed by the rotational angular momentum, namely, the formations of left‐ and right‐handed excitons at the +K and −K valleys, respectively, is proposed. It is found that angular momenta exchange between excitons and its surrounding phononic bath result in the large fluctuation of the effective g‐factor and the asymmetry of valley Zeeman splitting observed in most recently experiments, both of which sensitively depend on the magnetic moments provided by the phononic environment. This rotating exciton model not only proposes a new controllable knob in valleytronics, but opens the door to explore the angular momentum exchange of the chiral quasiparticles with the many‐body environment.
Funder
National Natural Science Foundation of China