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Observation of coherent acoustic and optical phonons in bismuth nanowires by a femtosecond pump-probe technique

J. Appl. Phys. 104, 103110 (2008); doi:10.1063/1.3021101

Published 19 November 2008

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Alexandre A. Kolomenskii, Sergey N. Jerebtsov, Haidong Liu, Hong Zhang, Zuxin Ye, Zhiping Luo, Wenhao Wu, and Hans A. Schuessler
Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA
Coherent acoustic and optical phonon oscillations in Bi nanowire samples were studied with a femtosecond pump-probe technique. Laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the terahertz range. The transmission signal of nanowires on a glass substrate and the signal of light scattered from freestanding nanowires were measured. The acoustic velocity in nanowires was found to be close to that of bulk polycrystalline material. The changes in the optical phonon frequency at different laser fluences were simulated taking into account excitation inhomogeneity, lattice anharmonicity, diffusion, and recombination of the carriers and gave good agreement with experimental results. ©2008 American Institute of Physics
History: Received 20 July 2008; accepted 30 September 2008; published 19 November 2008
Permalink: http://link.aip.org/link/?JAPIAU/104/103110/1
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KEYWORDS and PACS

Keywords
PACS
  • 63.22.Gh
    Phonons and vibrational states in nanotubes and nanowires
  • 78.47.-p
    Spectroscopy of solid state dynamics
  • YEAR: 2008

PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

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