Regensburg 2025 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 20: Many-body Quantum Dynamics II (joint session DY/TT)
DY 20.7: Vortrag
Mittwoch, 19. März 2025, 11:00–11:15, H37
Revealing ultrafast phonon mediated inter-valley scattering through transient absorption and high harmonic spectroscopies — •Kevin Lively1, Shunsuke Sato2,3, Guillermo Albareda2,4, Angel Rubio2, and Aaron Kelly2 — 1Deutsches Zentrum für Luft- und Raumfahrt — 2Max Planck Institute for the Structure and Dynamics of Matter — 3University of Tsukuba — 4Ideaded
Processes involving ultrafast laser driven electron-phonon dynamics play a fundamental role in the response of quantum systems in a growing number of situations of interest, as evinced by phenomena such as strongly driven phase transitions and light driven engineering of material properties. To show how these processes can be captured from a computational perspective, we simulate the transient absorption spectra and high-harmonic generation signals associated with valley selective excitation and intraband charge-carrier relaxation in monolayer hexagonal boron nitride. We show that the multitrajectory Ehrenfest dynamics approach, implemented in combination with real-time time-dependent density-functional theory and tight-binding models, offers a simple, accurate, and efficient method to study ultrafast electron-phonon coupled phenomena in solids under diverse pump-probe regimes which can be easily incorporated into the majority of real-time ab initio software packages.
Keywords: Electron-Phonon Dynamics; Valleytronics; High Harmonic Generation; non-equillibrium dynamics; thermalization