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Entropy Driven Atomic Motion in Laser-Excited Bismuth

Giret, Y; Gelle, A; Arnaud, B; (2011) Entropy Driven Atomic Motion in Laser-Excited Bismuth. PHYS REV LETT , 106 (15) , Article 155503. 10.1103/PhysRevLett.106.155503. Green open access

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Abstract

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.

Type: Article
Title: Entropy Driven Atomic Motion in Laser-Excited Bismuth
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.106.155503
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.106.155503
Language: English
Additional information: © 2011 American Physical Society
Keywords: TRANSPORT, LATTICE, SOLIDS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1333077
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