Small Atomic Displacements Recorded in Bismuth by the Optical Reflectivity of Femtosecond Laser-Pulse Excitations

Davide Boschetto 1 E.G. Gamaly 2 A.V. Rode 2 B. Luther-Davies 2 D. Glijer 1 T. Garl 1 O. Albert 1 Antoine Rousse 1 Jean Etchepare 1
1 LOA - Laboratoire d'optique appliquée
2 LPC - Laser Physics Centre
Abstract : Subtle atomic motion in a Bi crystal excited by a 35 fs-laser pulse has been recovered from the transient reflectivity of an optical probe measured with an accuracy of 10^-5. Analysis shows that a novel effect reported here—an initial negative drop in reflectivity—relates to a delicate coherent displacement of atoms by the polarization force during the pulse. We also show that reflectivity oscillations with a frequency coinciding with that of cold Bi are related to optical phonons excited by the electron temperature gradient through electron-phonon coupling.
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Submitted on : Tuesday, September 7, 2010 - 5:32:06 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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Davide Boschetto, E.G. Gamaly, A.V. Rode, B. Luther-Davies, D. Glijer, et al.. Small Atomic Displacements Recorded in Bismuth by the Optical Reflectivity of Femtosecond Laser-Pulse Excitations. Physical Review Letters, American Physical Society, 2008, 100 (2), pp.027404. ⟨10.1103/PhysRevLett.100.027404⟩. ⟨hal-00515651⟩

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