Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 30: Poster 2

HL 30.50: Poster

Thursday, September 8, 2022, 11:00–13:00, P3

Unraveling electron-phonon and exciton-phonon couplings in transition metal dichalcogenides. — •Ahmed Hasssanien, Arne Ungeheuer, Mashood Tariq Mir, Lukas Nöding, Arne Senftleben, and Thomas Baumert — University of Kassel, Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), D - 34132 Kassel, Germany

The observation of coherent phonons following resonant electronic excitation is a clear sign of the coupling between the electronic and the lattice degrees of freedom [1]. Using a highly compact femtosecond electron diffractometer developed in our group [2], we were able to differentiate between the electron-phonon and exciton-phonon couplings in mechanically exfoliated few-layers WSe2. Based on our results, both free and bound charge carriers couple to the interlayer vibrational modes. Further analysis of our results unveiled the specific modes coupled to either type of charge carrier.

[1] Jeong, Tae Young, et al. ACS Nano 10.5 (2016): 5560-5566

[2] Gerbig, C., et al. New J. Phys. 17.4 (2015):043050.