Back Cover: Observation of anisotropic interlayer Raman modes in few‐layer ReS2 (Phys. Status Solidi RRL 2/2016). Issue 2 (February 2016)

• Record Type: Journal Article
• Authors: Nagler, Philipp; Plechinger, Gerd; Schüller, Christian; Korn, Tobias
• Is Part Of: Physica status solidi. Volume 10:Issue 2(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-02
• Subjects: Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201670711
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : No abstract is available for this article. Abstract : Atomically thin transition‐metal dichalcogenides (TMDCs) can, like graphene, be prepared as two‐dimensional crystals by exfoliation. Unlike graphene, they are semiconductors with large bandgaps, which make them interesting for potential optoelectronic device applications. In TMDCs containing rhenium, such as ReS2 and ReSe2, the additional valence electron of the group‐VII element Re leads to the formation of in‐plane Re–Re bonds, which distort the crystal lattice and reduce its symmetry, resulting in anisotropic electronic and optical properties. Nagler et al. (pp. 185–189 ) have studied the Raman spectrum of single‐ and few‐layer ReS2 flakes in the ultralow frequency range. They were able to observe two Raman modes which are characteristic for layered materials: the interlayer shear (LSM) and breathing (LBM) modes, in which adjacent layers rigidly oscillate relative to each other within or perpendicular to the layer plane, respectively. Both Raman modes shift to lower energy with increasing number of layers. Remarkably, the energy of the LSM also depends on the laser polarization orientation, indicating that the in‐plane shear modulus of few‐layer ReS2 is highly anisotropic. The results demonstrate that Raman spectroscopy is a powerful tool for the study of few‐layer ReS2 and may further the understanding of this novel two‐dimensional crystal.