Physics – Condensed Matter – Materials Science
Scientific paper
2010-10-21
Physics
Condensed Matter
Materials Science
11 pages, 8 figures. This paper is accepted for publication in Physics Letters A
Scientific paper
We have applied femtosecond pump-probe technique with variable pump wavelength to study coherent lattice dynamics in Bi single crystal. Comparison of the coherent amplitude as a function of pump photon energy for two different in symmetry Eg and A1g phonon modes with respective spontaneous resonance Raman profiles reveals that their generation mechanisms are quite distinct. We show that displacive excitation, which is the main mechanism for the generation of coherent A1g phonons, cannot be reduced to the Raman scattering responsible for the generation of lower symmetry coherent lattice modes
Chekalin Sergei V.
Melnikov Alexander
Misochko Oleg V.
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