Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 57: Focus Session: Many-body effects in two-dimensional materials

O 57.4: Talk

Wednesday, March 9, 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.