Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.14: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

Structural Dynamics of Rhenium Disulphide Studied by Ultrafast Electron Diffraction — Arne Ungeheuer, •Ahmed Hassanien, Marlene Adrian, Arne Senftleben, and Thomas Baumert — Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Strasse 40, D-34132 Kassel, Germany

Unlike most two-dimensional transition metal dichalcogenides (MoS₂, WSe₂, etc...), rhenium disulphide (ReS₂) shows minor dependence of its electronic and vibrational properties on the number of stacked atomic layers [1]. Its distorted triclinic crystal structure due to in-plane dimerization of Re atoms results in a weak binding energy between its layers and consequently weak coupling. On the other hand, due to this so-called Peierls distortion, ReS₂ shows significant polarization-dependent optical properties which hold promise for such applications as valleytronics [2].

Ultrafast electron diffraction is a continuously developing technique for providing direct insights into photo-induced primary dynamics at the atomic level in molecules and solids. Using a highly compact femtosecond electron diffractometer developed in our group [3], we show our first measurements of the structural dynamics of mechanically-exfoliated few-layer ReS₂ revealed on a picosecond timescale, following the photoexcitation with a femtosecond laser pulse.

References:

[1] Tongay, Sefaattin, et al. Nature communications 5 (2014): 3252.

[2] Cui, Yudong, et al. Scientific Reports 7 (2017): 40080.

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