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Small Atomic Displacements Recorded in Bismuth by the Optical Reflectivity of Femtosecond Laser-Pulse Excitations
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.
https://hal-polytechnique.archives-ouvertes.fr/hal-00515651
Contributor : Thuy Le <>
Submitted on : Tuesday, September 7, 2010 - 5:32:06 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM
Contributor : Thuy Le <>
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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