Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Focus Session: Electron-Phonon Interactions I
O 52.2: Vortrag
Mittwoch, 3. April 2019, 11:00–11:15, H15
Electron-phonon coupling in laser-induced nonequilibrium states of solids — Tobias Held1, Sebastian T. Weber1, Isabel Klett1, Jan Vorberger2, and •Baerbel Rethfeld1 — 1Fachbereich Physik und Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern — 2Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf e.V., 01328 Dresden
Ultrafast laser pulses heat electrons in solids to highly nonequilibrium distributions. The subsequent energy transfer to the lattice induce nonequilibrium distributions in the phonon system as well. We analyse, how these nonequilibrium states influence the electron-phonon energy transfer as compared to the standard two-temperature model.
Motivated by a nonthermal lattice model [1], we
determine the energy transfer from the hot electrons to different
phonon modes. The partial Eliashberg functions are obtained with
DFT methods, while the relaxation dynamics is traced with
help of Boltzmann collision integrals.
We also evaluate phonon-phonon scattering terms and examine the phonon relaxation and its influence on the electron-phonon energy transfer [2].
Finally, we show that the electron-phonon scattering can induce a
secondary nonequilibrium state
in the electron distribution persisting on the timescale
of lattice heating [3].
L. Waldecker, R. Bertoni, R. Ernstorfer, J. Vorberger,
PRX 6, 021003 (2016).
I. Klett and B. Rethfeld, PRB 98, 144306 (2018).
S.T. Weber and B. Rethfeld,
arXiv:1801.06560 (2018).