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Entropy Driven Atomic Motion in Laser-Excited Bismuth

Abstract : We introduce a thermodynamical model based on the two-temperature approach in order to fully understand the dynamics of the coherent A1g 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)SCIEAS0036-807510.1126/science.1135009] 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.
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Submitted on : Tuesday, June 26, 2012 - 11:16:19 AM
Last modification on : Wednesday, May 16, 2018 - 11:23:23 AM

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Y. Giret, Alain Gellé, Brice Arnaud. Entropy Driven Atomic Motion in Laser-Excited Bismuth. Physical Review Letters, American Physical Society, 2011, 106 (15), pp.155503. ⟨10.1103/PHYSREVLETT.106.155503⟩. ⟨hal-00711987⟩



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