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HL: Fachverband Halbleiterphysik

HL 76: Poster IIIC

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 [1], Ultrafast electron diffraction represents a direct visualization of the coherent atomic oscillations providing an insight into the electron-phonon coupling strength [2]. Using a highly compact femtosecond electron diffractometer developed in our group [3], 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 [4]. In this work we also concluded about the dependence of the electron-phonon coupling strength on the polarization state of the excitation pulse.

References: [1] Ishioka, Kunie, et al. Journal of Physics:Condensed Matter 31.9 (2019):094003. [2] Chatelain, Robert P., et al. Physical review letters 113.23 (2014):235502. [3] Gerbig, C., et al. New J. Phys. 17.4 (2015):043050. [4] Cui, Yudong, et al. Scientific Reports 7 (2017):40080.