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- W2092643739 abstract "Abstract The inherent valley-contrasting optical selection rules for interband transitions at the K and K′ valleys in monolayer MoS 2 have attracted extensive interest. Carriers in these two valleys can be selectively excited by circularly polarized optical fields. The comprehensive dynamics of spin valley coupled polarization and polarized exciton are completely resolved in this work. Here, we present a systematic study of the ultrafast dynamics of monolayer MoS 2 including spin randomization, exciton dissociation, free carrier relaxation and electron-hole recombination by helicity- and photon energy-resolved transient spectroscopy. The time constants for these processes are 60 fs, 1 ps, 25 ps and ~300 ps, respectively. The ultrafast dynamics of spin polarization, valley population and exciton dissociation provides the desired information about the mechanism of radiationless transitions in various applications of 2D transition metal dichalcogenides. For example, spin valley coupled polarization provides a promising way to build optically selective-driven ultrafast valleytronics at room temperature. Therefore, a full understanding of the ultrafast dynamics in MoS 2 is expected to provide important fundamental and technological perspectives." @default.
- W2092643739 created "2016-06-24" @default.
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- W2092643739 date "2015-02-06" @default.
- W2092643739 modified "2023-10-17" @default.
- W2092643739 title "Ultrafast Multi-Level Logic Gates with Spin-Valley Coupled Polarization Anisotropy in Monolayer MoS2" @default.
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- W2092643739 doi "https://doi.org/10.1038/srep08289" @default.
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