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O: Fachverband Oberflächenphysik

O 70: Structural Dynamics in Nanoscale Materials Probed by Ultrashort Electron Pulses

O 70.1: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Lattice dynamics in few-layer Molybdenum disulfide investigated by Ultrafast Electron Diffraction — •Marlene Adrian, Christian Gerbig, Silvio Morgenstern, Christian Sarpe, Arne Senftleben, and Thomas Baumert — University of Kassel, Institute of Physics (CINSaT), D-34132 Kassel, Germany

Molybdenum disulfide (MoS2) is a prototype example for transition metal dichalcogenides (TMDs), which form a group of van der Waals bound two-dimensional layered materials [1]. Due to their unique electronic and optical properties such as circular dichroism, a strong spin-orbit coupling and a shift from indirect to direct band gap semiconductor with decreasing film thickness from bulk to monolayer, TMDs are interesting for both fundamental research and industrial applications such as electronic devices [2].

We study dynamical processes following optical excitation in few-layer MoS2 by means of time-resolved Ultrafast Electron Diffraction (UED), which has become a promising technique to directly provide insights into dynamics in crystalline solids at the microscopic level with a sub-picosecond temporal resolution [3, 4]. Our highly compact UED-setup is fully characterized by experiments and many-body simulations [5].

[1] S. Z. Butler et al., ACS Nano 7, 2898 (2013).

[2] G. Berghäuser and E. Malic, arXiv:1311.1045 (2014).

[3] A. H. Zewail, J. Phys. Chem. 98, 2782-2796 (1994).

[4] B. Siwick and D. Miller, Science 302, 1382-1385 (2003).

[5] C. Gerbig et al., in preparation (2014).