Electron cooling and Debye-Waller effect in photoexcited bismuth

Abstract

By means of first principles calculations, we computed the effective electron-phonon coupling constant $G_0$ governing the electron cooling in photoexcited bismuth. $G_0$ strongly increases as a function of electron temperature, which can be traced back to the semi-metallic nature of bismuth. We also used a thermodynamical model to compute the time evolution of both electron and lattice temperatures following laser excitation. Thereby, we simulated the time evolution of (1 -1 0), (-2 1 1) and (2 -2 0) Bragg peak intensities measured by Sciaini et al [Nature 458, 56 (2009)] 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.

References in corpus (4)

• Direct observation of optically induced transient structures in graphite using ultrafast electron crystallography
• Coherent Phonon Coupling to Individual Bloch States in Photoexcited Bismuth
• Entropy driven atomic motion in laser-excited bismuth
• Nonadiabatic generation of coherent phonons

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• Anisotropic thermal expansion of bismuth from first principles
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• Fingerprints of hot-phonon physics in time-resolved correlated quantum lattice dynamics
• Visualizing femtosecond dynamics with ultrafast electron probes through terahertz compression and time-stamping
• Nonlinear phononics in Bi${}_2$Te${}_3$ nanoscale thin films: A theoretical approach