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• W3025121057 abstract "Photoluminescence spectra show that monolayer transition-metal dichalcogenides (ML-TMDs) possess charged exciton binding energies, conspicuously similar to the energy of optical phonons. This enigmatic coincidence has offered opportunities to investigate many-body interactions between trion ${X}_{ensuremath{-}}$, exciton $X$, and phonon and led to efficient excitonic anti-Stokes processes with the potential for laser refrigeration and energy harvesting. In this study, we show that in ${mathrm{WSe}}_{2}$ materials, the trion binding energy matches two phonon modes, the out-of-plane ${A}_{1}^{ensuremath{'}}$ and the in-plane ${E}^{ensuremath{'}}$ modes. In this respect, using the Fermi golden rule together with the effective mass approximation, we investigate the rate of the population transfers between $X$ and ${X}_{ensuremath{-}}$, mediated by a single phonon. We demonstrate that, while the absolute importance of the two phonon modes on the up-conversion process strongly depends on the experimental conditions such as the temperature and the dielectric environment (substrate), both modes lead to an up-conversion process on time scales in the range of few picoseconds to subnanoseconds, consistent with recent experimental findings. The conjugate process is also investigated in our study, as a function of temperature $T$ and electron density ${N}_{e}$. We prove that the exciton to trion down-conversion process is very unlikely at low electron density ${N}_{e}<{10}^{10}phantom{rule{4.pt}{0ex}}{text{cm}}^{ensuremath{-}2}$ and high temperature $T>50phantom{rule{4.pt}{0ex}}text{K}$ while it increases dramatically to reach few picoseconds time scale at low temperature and for electron density ${N}_{e}>{10}^{10}phantom{rule{4.pt}{0ex}}{text{cm}}^{ensuremath{-}2}$. Finally, our results show that the conversion processes occur more rapidly in exemplary monolayer molybdenum-based dichalcogenides (${mathrm{MoSe}}_{2}$ and ${mathrm{MoTe}}_{2}$) than tungsten dichalcogenides." @default.
• W3025121057 created "2020-05-21" @default.
• W3025121057 creator A5025203605 @default.
• W3025121057 creator A5060146600 @default.
• W3025121057 creator A5060668572 @default.
• W3025121057 creator A5080171651 @default.
• W3025121057 date "2020-09-08" @default.
• W3025121057 modified "2023-10-06" @default.
• W3025121057 title "Phonon-assisted exciton/trion conversion efficiency in transition metal dichalcogenides" @default.
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• W3025121057 doi "https://doi.org/10.1103/physrevb.102.125410" @default.
• W3025121057 hasPublicationYear "2020" @default.
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