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- W2034785718 abstract "We investigate the valley depolarization due to the electron-hole exchange interaction in monolayer MoS$_{2}$. Both the long- and short-range parts of the intra- and inter-valley electron-hole exchange interactions are calculated. We find that both the long- and short-range exchange interactions can cause the inter- and intra-valley bright exciton transitions. With the intra-valley bright exciton transition channel nearly forbidden due to the large splitting of the valence bands, the inter-valley channel due to the exchange interaction can cause the valley depolarization efficiently by the Maialle-Silva-Sham mechanism [Phys. Rev. B {bf 47}, 15776 (1993)]. With only the long-range exchange interaction, the calculations show good agreement with the recent valley polarization experiments, including the time-resolved valley polarization measurement, the pump-probe experiment and the steady-state PL polarization measurement. We further show that for the A-exciton with large (small) center-of-mass momentum, the long-range exchange interaction can cause the {em fast} ({em slow}) inter-valley exciton transition." @default.
- W2034785718 created "2016-06-24" @default.
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- W2034785718 date "2014-05-12" @default.
- W2034785718 modified "2023-10-12" @default.
- W2034785718 title "Valley depolarization due to intervalley and intravalley electron-hole exchange interactions in monolayer<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mtext>MoS</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:math>" @default.
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- W2034785718 doi "https://doi.org/10.1103/physrevb.89.205303" @default.
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