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- W2800691972 abstract "Black phosphorus is a layered semiconducting material, demonstrating strong layer-dependent optical and electronic properties. Probing the photophysical properties on ultrafast time scales is of central importance in understanding many-body interactions and nonequilibrium quasiparticle dynamics. Here, we applied temporally, spectrally, and spatially resolved pump–probe microscopy to study the transient optical responses of mechanically exfoliated few-layer black phosphorus, with layer numbers ranging from 2 to 9. We have observed layer-dependent resonant transient absorption spectra with both photobleaching and red-shifted photoinduced absorption features, which could be attributed to band gap renormalization of higher subband transitions. Surprisingly, coherent phonon oscillations with unprecedented intensities were observed when the probe photons were in resonance with the optical transitions, which correspond to the low-frequency layer-breathing mode. Our results reveal strong Coulomb interactions and electron–phonon couplings in photoexcited black phosphorus, providing important insights into the ultrafast optical, nanomechanical, and optoelectronic properties of this novel two-dimensional material." @default.
- W2800691972 created "2018-05-17" @default.
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- W2800691972 date "2018-04-23" @default.
- W2800691972 modified "2023-10-16" @default.
- W2800691972 title "Layer-Dependent Ultrafast Carrier and Coherent Phonon Dynamics in Black Phosphorus" @default.
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- W2800691972 doi "https://doi.org/10.1021/acs.nanolett.8b00551" @default.
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