Dresden 2020 – wissenschaftliches Programm
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HL 76.17: Poster
Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG
Coherent Dynamics in Rhenium Disulphide Studied by Ultrafast Electron Diffraction — •Ahmed Hassanien, Arne Ungeheuer, Mashood Tariq Mir, Arne Senftleben, and Thomas Baumert — Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Strasse 40, D-34132 Kassel, Germany
Coherent phonons are interesting phenomenona where lattice vibrations are coherently excited by the impact of an ultrashort laser pulse. While pump-probe-based reflectometry experiments provide an indirect visualization for such coherent phenomena , Ultrafast electron diffraction represents a direct visualization of the coherent atomic oscillations providing an insight into the electron-phonon coupling strength . Using a highly compact femtosecond electron diffractometer developed in our group , we were able to probe the coherent structural dynamics of mechanically-exfoliated few-layers ReS2 revealed on a picosecond time scale, following the photoexcitation by femtosecond laser pulses. ReS2 shows highly anisotropic structure due to which its optical properties showed significant polarization-dependence compared to TMDCs of hexagonal structure . In this work we also concluded about the dependence of the electron-phonon coupling strength on the polarization state of the excitation pulse.
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