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Electron Cooling and Debye-Waller Effect in Photoexcited Bismuth

Abstract : By means of first principles calculations, we compute the effective electron-phonon coupling constant G0 governing the electron cooling in photoexcited bismuth. G0 strongly increases as a function of electron temperature, which can be traced back to the semimetallic nature of bismuth. We also use a thermodynamical model to compute the time evolution of both electron and lattice temperatures following laser excitation. Thereby, we simulate the time evolution of (1 -1 0), (-2 1 1) and (2 -2 0) Bragg peak intensities measured by Sciaini et al. [Nature (London) 458, 56 (2009)NATUAS0028-0836] in femtosecond electron diffraction experiments. The effect of the electron temperature on the Debye-Waller factors through the softening of all optical modes across the whole Brillouin zone turns out to be crucial to reproduce the time evolution of these Bragg peak intensities.
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Submitted on : Friday, March 29, 2013 - 10:38:27 AM
Last modification on : Wednesday, May 16, 2018 - 11:23:21 AM

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Brice Arnaud, Y. Giret. Electron Cooling and Debye-Waller Effect in Photoexcited Bismuth. Physical Review Letters, American Physical Society, 2013, 110 (1), pp.16405. ⟨10.1103/PHYSREVLETT.110.016405⟩. ⟨hal-00805890⟩



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