Raman Spectroscopy of Anisotropic Two-Dimensional Materials

Abstract

Due to the in-plane structural anisotropy, two-dimensional (2D) layered materials with low symmetry exhibit unique crystalline-axis dependent properties, including the optical, mechanical and electrical properties. Raman spectroscopy, in particular, polarized Raman spectroscopy, has been used as a rapid and non-invasive technique to study the composition, structure and symmetry of 2D anisotropic layered materials. In this chapter, the recent advances on the Raman spectroscopic studies of anisotropic 2D materials are summarized. The Raman selection rules and the structural symmetry will be discussed, followed by the overview of the polarized Raman scattering studies of anisotropic 2D materials cataloged by crystal symmetries.