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.
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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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