Phys. Rev. Lett. 88, 067401 (2002) [4 pages]Dynamics of Coherent Anharmonic Phonons in Bismuth Using High Density PhotoexcitationReceived 27 August 2001; published 24 January 2002 We have investigated the dynamical properties of the coherent anharmonic phonons generated in Bi under high density excitation. The time-resolved reflectivity in the intensely photoexcited Bi film is modulated by the coherent A1g phonon oscillation with a time-dependent oscillation period. As the pump power density is increased, the line shape of the A1g mode in the Fourier transformed spectra becomes asymmetric, and the redshift of the phonon frequency is observed. Analysis of the transient redshift with a wavelet transform reveals that the frequency of the A1g mode depends on the squared amplitude of the oscillation, which is attributed to an anharmonicity of the lattice potential. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.067401
DOI:
10.1103/PhysRevLett.88.067401
PACS:
78.47.+p, 63.20.Ry, 78.66.Bz
See AlsoReply: S. Fahy and D. A. Reis, Coherent Phonons: Electronic Softening or Anharmonicity?, Phys. Rev. Lett. 93, 109701 (2004). Reply: Muneaki Hase, Masahiro Kitajima, Shin-ichi Nakashima, and Kohji Mizoguchi, Hase et al. Reply:, Phys. Rev. Lett. 93, 109702 (2004). |
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