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Lattice dynamics in few-layer Molybdenum disulfide investigated by Ultrafast Electron Diffraction

HT-04

Lattice dynamics in few-layer Molybdenum disulfide investigated by Ultrafast Electron Diffraction


Marlene Adrian1*, Christian Gerbig1, Silvio Morgenstern1, Christian Sarpe1, Arne Senftleben1, Thomas Baumert1

1University of Kassel, Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT)

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, 3]. 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 [4, 5]. Our highly compact UED-setup is fully characterized by experiments and many-body simulations [6].

Fig. 1. Left: Ultrafast Electron Diffraction-setup. Right: Measured Electron Diffraction Pattern of Molybdenum disulfide.

Fig. 1. Left: Ultrafast Electron Diffraction-setup. Right: Measured Electron Diffraction Pattern of Molybdenum disulfide.

References:

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

[2] G. Berghäuser and E. Malic, Phys. Rev. B 89, 125309 (2014).

[3] B. Radisavljevic, A. Radenovic, J. Brivio, V. Giacometti and A. Kis, Nature Nanotech. 6, 147-150 (2011).

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

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

[6] C. Gerbig, A. Senftleben, S. Morgenstern, C. Sarpe and T. Baumert, New J. Phys. 17, 043050 (2015).