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- W4310593923 abstract "Two-dimensional transition metal dichalcogenides (TMDs) have great potential application for seamless on-chip integration due to their strong photon-electron-spin-valley coupling. However, the contact-free measurements of the valley-coupled photocurrent in TMDs is still challenging. Here, ultrafast terahertz emission spectroscopy is employed to investigate the photocurrent dynamics in monolayer WSe2, and an interface-induced drift current amplification is found in the WSe2/Si heterostructure. The amplification of terahertz emission comes from the photocurrent enlarged by band bending in the WSe2 and Si junction, and the amplification ratio increase further near the valley resonant transition of WSe2. In addition, the valley-momentum locked photocurrent in the WSe2/Si heterostructure reserves the same chirality with monolayer WSe2 at room temperature. These findings could provide a new method for manipulating valley-momentum locked photocurrent by photon helicity and open new avenues for TMD-based valley-polarized terahertz emission devices." @default.
- W4310593923 created "2022-12-12" @default.
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- W4310593923 date "2022-12-02" @default.
- W4310593923 modified "2023-10-14" @default.
- W4310593923 title "Ultrafast Drift Current Terahertz Emission Amplification in the Monolayer WSe<sub>2</sub>/Si Heterostructure" @default.
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- W4310593923 doi "https://doi.org/10.1021/acs.jpclett.2c03347" @default.
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