Small Atomic Displacements Recorded in Bismuth by the Optical Reflectivity of Femtosecond Laser-Pulse Excitations - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2008

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

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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.

Dates and versions

hal-00515651 , version 1 (07-09-2010)

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Cite

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, 2008, 100 (2), pp.027404. ⟨10.1103/PhysRevLett.100.027404⟩. ⟨hal-00515651⟩
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