Coherent Lattice Vibrations in Mono- and Few-Layer WSe2

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We report the observation of coherent lattice vibrations in mono- and few-layer WSe2 in the time domain, which were obtained by performing time-resolved transmission measurements. Upon the excitation of ultrashort pulses with the energy resonant to that of A excitons, coherent oscillations of the A(1g) optical phonon and longitudinal acoustic phonon at the M point of the Brillouin zone (LA(M)) were impulsively generated in monolayer WSe2. In multilayer WSe2 flakes, the interlayer breathing mode (B-1) is found to be sensitive to the number of layers, demonstrating its usefulness in characterizing layered transition metal dichalcogenide materials. On the basis of temperature-dependent measurements, we find that the Aig optical phonon mode decays into two acoustic phonons through the anharmonic decay process
Publisher
AMER CHEMICAL SOC
Issue Date
2016-05
Language
English
Article Type
Article
Keywords

TRANSITION-METAL DICHALCOGENIDES; RAMAN-SCATTERING; BULK WSE2; MOS2; PHONONS; WS2; SPECTROSCOPY; MONOLAYERS; EVOLUTION; FREQUENCY

Citation

ACS NANO, v.10, no.5, pp.5560 - 5566

ISSN
1936-0851
DOI
10.1021/acsnano.6b02253
URI
http://hdl.handle.net/10203/209727
Appears in Collection
EEW-Journal Papers(저널논문)
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