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Title: Observation of low-wavenumber out-of-plane optical phonon in few-layer graphene
Authors: Shang, J.
Cong, C.
Zhang, J.
Xiong, Q.
Gurzadyan, G.G.
Yu, T. 
Keywords: coherent phonon
few-layer graphene
Raman scattering
ultrafast spectroscopy
Issue Date: Jan-2013
Citation: Shang, J., Cong, C., Zhang, J., Xiong, Q., Gurzadyan, G.G., Yu, T. (2013-01). Observation of low-wavenumber out-of-plane optical phonon in few-layer graphene. Journal of Raman Spectroscopy 44 (1) : 70-74. ScholarBank@NUS Repository.
Abstract: Few-layer graphene grown by chemical vapor deposition has been studied by Raman and ultrafast laser spectroscopy. A low-wavenumber Raman peak of ~120 cm-1 and a phonon-induced oscillation in the kinetic curve of electron-phonon relaxation process have been observed, respectively. The Raman peak is assigned to the low-wavenumber out-of-plane optical mode in the few-layer graphene. The phonon band shows an asymmetric shape, a consequence of so-called Breit-Wigner-Fano resonance, resulting from the coupling between the low-wavenumber phonon and electron transitions. The obtained oscillation wavenumber from the kinetic curve is consistent with the detected low-wavenumber phonon by Raman scattering. The origin of this oscillation is attributed to the generation of coherent phonons and their interactions with photoinduced electrons. Copyright © 2012 John Wiley & Sons, Ltd.
Source Title: Journal of Raman Spectroscopy
ISSN: 03770486
DOI: 10.1002/jrs.4141
Appears in Collections:Staff Publications

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