Exciton fine structure splitting and linearly polarized emission in strained transition-metal dichalcogenide monolayers
arXiv:2206.13847 · doi:10.1103/PhysRevB.106.125303
Abstract
We study theoretically effects of an anisotropic elastic strain on the exciton energy spectrum fine structure and optical selection rules in atom-thin crystals based on transition-metal dichalcogenides. The presence of strain breaks the chiral selection rules at the -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 uniaxially strained WSe 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.
12 pages, 5 figures
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Cited by in corpus (13)
- Photoluminescence imaging of single photon emitters within nanoscale strain profiles in monolayer WSe
- Strain control of exciton and trion spin-valley dynamics in monolayer transition metal dichalcogenides
- Creation and Microscopic Origins of Single-Photon Emitters in Transition Metal Dichalcogenides and Hexagonal Boron Nitride
- Self-Induced Valley Bosonic Stimulation of Exciton-Polaritons in a Monolayer Semiconductor
- High-purity and stable single-photon emission in bilayer WSe via phonon-assisted excitation
- Longitudinal-transverse splitting and fine structure of Fermi polarons in two-dimensional semiconductors
- Biaxial strain tuning of exciton energy and polarization in monolayer WS2
- Coherent spin dynamics of excitons in strained monolayer semiconductors
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- Controllable fusion of electromagnetic bosons in two-dimensional semiconductors
- Quantum valley pseudospin controlled by strain
- Effects of Strain-Induced Pseudogauge Fields on Exciton Dispersion, Transport, and Interactions in Transition Metal Dichalcogenides Nanoribbons
- Excitonic optical absorption in strained monolayer CrSBr