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- W3100691358 abstract "We examine a mechanism by which excitons undergo ultrafast relaxation in common monolayer transition metal dichalcogenides. It is shown that at densities ≈1 × 1011 cm−2 and temperatures ≤60 K, excitons in well known monolayers (MoS2, MoSe2, WS2, and WSe2) exist as point-like structureless electron-hole quasi-particles. We evaluate the average rate of exciton energy relaxation due to acoustic phonons via the deformation potential and the piezoelectric coupling mechanisms and examine the effect of spreading of the excitonic wavefunction into the region perpendicular to the monolayer plane. Our results show that the exciton relaxation rate is enhanced with increase in the exciton temperature, while it is decreased with increase in the lattice temperature. Good agreements with available experimental data are obtained when the calculations are extrapolated to room temperatures. A unified approach taking into account the deformation potential and piezoelectric coupling mechanisms shows that exciton relaxation induced by phonons is as significant as defect assisted scattering and trapping of excitons by surface states in monolayer transition metal dichalcogenides." @default.
- W3100691358 created "2020-11-23" @default.
- W3100691358 creator A5048877980 @default.
- W3100691358 date "2016-04-28" @default.
- W3100691358 modified "2023-09-25" @default.
- W3100691358 title "Ultrafast exciton relaxation in monolayer transition metal dichalcogenides" @default.
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- W3100691358 doi "https://doi.org/10.1063/1.4947447" @default.
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