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

Boschetto, David; Gamaly, Eugene G; Rode, Andrei V; Glijer, D. G.; Luther-Davies, Barry; Garl, T.; Albert, O.; Rousse, Antoine; Etchepare, J.


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...[Show more]

CollectionsANU Research Publications
Date published: 2008
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.100.027404


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