Ultrafast processes in Ag and Au: A Monte Carlo study

Abstract

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Phonon-induced long-lasting nonequilibrium in the electron system of a laser-excited solid

“…Thus, conventional temperature-based models reach their limits to describe the dynamics and the energy dissipation inside the material. Kinetic models, like the Boltzmann equation 18,[29][30][31][32][33] or Monte-Carlo methods 25,34 allow to trace the evolution of the electronic nonequilibrium. The electronic thermalization 18,[29][30][31][35][36][37] and the influence of the different stages of electronic nonequilibrium distributions on further energy dissipation processes 15,18,[27][28][29]36,38 are in the focus of interest and their details are heavily discussed topics.…”

Piezoelectric Response to Coherent Longitudinal and Transverse Acoustic Phonons in a Semiconductor Schottky Diode

“…Figure 5(a) shows the calculated temporal evolutions of δVðtÞ for QLA and QTA phonons, respectively. For the DP contribution, we consider only the response corresponding to the depletion-layer edge in the semiconductor because, although the deformation constant in metals is not well known [25], available data suggests that it is smaller (in absolute value) than that of GaAs. The contributions from PE and DP mechanisms calculated separately show the PE mechanism to be dominant in δV for both modes of phonons.…”

Molecular wires acting as quantum heat ratchets

“…the Fermi-Dirac distribution and the Bose-Einstein distribution, respectively, which both inherit a time-dependence from the temperature modulation. This implies a time-scale separation which is justified by the fact that laser heating of a metallic system, the electrons undergo rather fast thermalization [58,59,60,61]. The corresponding relaxation times stem from electron-electron and electronphonon interaction, and for a typical metal is in the order of a few fs or ps, respectively [62,63].…”