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- W3208997135 abstract "The ultrafast photoexcited carrier and coherent phonon dynamics of 20 nm PtTe2 film on fused silica substrate were investigated systematically at room temperature using degenerate and non-degenerate femtosecond (fs) pump-probe spectroscopy. After 780 nm optical pump, photo-induced bleaching (PB) signal was observed, which originated from the band filling effect. The incoherent relaxation processes can be reproduced well with a double-exponential decay function, which have been assigned as the cooling of the thermal carriers and the recombination of electron-hole pairs mediated by phonon, respectively. Two distinct oscillation modes were identified, the low-frequency mode corresponds to the excitation of coherent acoustic phonon by photolaunched stress wave, and the high frequency mode is due to the coherent optical phonon stemming from out-of-plane (A1g) lattice motion. Our study provides an in-depth understanding to the relaxation mechanisms and phonons behavior of PtTe2 film in nonequilibrium states, and might pave the way for the design of electronic and optoelectronic devices." @default.
- W3208997135 created "2021-11-08" @default.
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- W3208997135 date "2021-08-29" @default.
- W3208997135 modified "2023-09-27" @default.
- W3208997135 title "Ultrafast photocarrier dynamics in Dirac semimetal PtTe2 thin film" @default.
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- W3208997135 doi "https://doi.org/10.1109/irmmw-thz50926.2021.9567538" @default.
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