期刊
PHYSICAL REVIEW B
卷 106, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.125303
关键词
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资金
- RSF [19-12-00051]
- NSF QII TAQS [1936276]
- NSF [DMR-2130544]
- DFG via the Emmy Noether Initiative [CH 1672/1, 287022282, 422 31469 5032SFB1277, A01, B05]
- Wuerzburg Dresden Cluster of Excellence [EXC 2147, 390858490]
- JSPS KAKENHI [19H05790, 20H00354, 21H05233]
In this study, we theoretically investigate the influence of anisotropic elastic strain on the fine structure of the exciton energy spectrum and optical selection rules in atomically thin transition-metal dichalcogenide crystals. We find that strain breaks the selection rules and induces linearly polarized optical transitions. Additionally, the applied strain leads to momentum-dependent Zeeman splitting.
We study theoretically the effects of an anisotropic elastic strain on the exciton energy spectrum fine structure and optical selection rules in atomically thin crystals based on transition-metal dichalcogenides. The presence of strain breaks the chiral selection rules at the K points of the Brillouin zone and makes optical transitions linearly polarized. The orientation of the induced linear polarization is related to the main axes of the strain tensor. Elastic strain provides an additive contribution to the exciton fine structure splitting, in agreement with experimental evidence obtained from the uniaxially strained WSe2 monolayer. The applied strain also induces momentum-dependent Zeeman splitting. Depending on the strain orientation and magnitude, Dirac points with a linear dispersion can be formed in the exciton energy spectrum. We provide a symmetry analysis of the strain effects and develop a microscopic theory for all relevant strain-induced contributions to the exciton fine structure Hamiltonian.
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