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Phonon Dephasing Dynamics in MoS2
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DOI：10.1021/acs.nanolett.0c04368.png)
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A variety of quantum degrees of freedom, e.g., spins, valleys, and localized emitters, in atomically thin van der Waals materials have been proposed for quantum information applications, and they inevitably couple to phonons. Here, we directly measure the intrinsic optical phonon decoherence in monolayer and bulk MoS2 by observing the temporal evolution of the spectral interference of Stokes photons generated by pairs of laser pulses. We find that a prominent optical phonon mode E(2g )exhibits a room-temperature dephasing time of similar to 7 ps in both the monolayer and bulk. This dephasing time extends to similar to 20 ps in the bulk crystal at similar to 15 K, which is longer than previously thought possible. First-principles calculations suggest that optical phonons decay via two types of three-phonon processes, in which a pair of acoustic phonons with opposite momentum are generated.
Keyword:
transition metal dichalcogenides
phonon dephasing
transient coherent ultrafast phonon spectroscopy
scattering phase space
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期刊
IF:
9.1
论文数:
2.7W
被引数:
16.5W
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