Entropy driven atomic motion in laser-excited bismuth

We introduce a thermodynamical model based on the two-temperature approach in order to fully understand the dynamics of the coherent A(1g) phonon in laser-excited bismuth. Using this model, we simulate the time evolution of (111) Bragg peak intensities measured by Fritz et al. [Science 315, 633 (200...

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Bibliographic Details
Published in:Physical review letters 2011-04, Vol.106 (15), p.155503-155503, Article 155503
Main Authors: Giret, Y, Gellé, A, Arnaud, B
Format: Article
Language:English
Subjects:
BISMUTH
BRAGG CURVE
Chemical Physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COHERENT SCATTERING
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIAGRAMS
DIFFRACTION
ELECTRON TEMPERATURE
ELEMENTS
ENTROPY
INFORMATION
LASERS
METALS
PHONONS
PHYSICAL PROPERTIES
Physics
QUASI PARTICLES
SCATTERING
THERMODYNAMIC PROPERTIES
X-RAY DIFFRACTION
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Summary:We introduce a thermodynamical model based on the two-temperature approach in order to fully understand the dynamics of the coherent A(1g) phonon in laser-excited bismuth. Using this model, we simulate the time evolution of (111) Bragg peak intensities measured by Fritz et al. [Science 315, 633 (2007)] in femtosecond x-ray diffraction experiments performed on a bismuth film for different laser fluences. The agreement between theoretical and experimental results is striking not only because we use fluences very close to the experimental ones but also because most of the model parameters are obtained from ab initio calculations performed for different electron temperatures.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.106.155503