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Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 49: Focus Session: Many-body effects in two-dimensional materials (Joint session of HL and O, organized by HL)

HL 49.4: Vortrag

Mittwoch, 9. März 2016, 10:30–10:45, H16

Probing the anisotropic interlayer Raman modes of few-layer ReS2 — •Philipp Nagler, Gerd Plechinger, Christian Schüller, and Tobias Korn — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040, Regensburg, Germany

ReS2 has recently emerged as a new member in the rapidly expanding family of two-dimensional materials. Unlike MoS2 or WSe2, the optical and electrical properties of ReS2 are not isotropic due to the reduced symmetry of the crystal. Here, we probe the anisotropic behavior of ReS2 by Raman spectroscopy in the ultralow frequency regime. Thereby, we are able to access the layer breathing modes (LBM) and shear modes (LSM) of the material which stem from rigid-layer oscillations. The layer dependence of their peak positions enables an easy determination of the layer number of the crystal and can be readily reproduced by means of a monoatomic chain model. By varying the angle between the linearly polarized laser and the in-plane crystal axis, we are able to reveal an energetic shift of the LSM which is directly linked to the in-plane anisotropy of the shear modulus in this material.

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