Raman Scattering Modification in Monolayer ReS₂ Controlled by Strain Engineering^*

Regulation of optical properties and electronic structure of two-dimensional layered ReS₂ materials has attracted much attention due to their potential in electronic devices. However, the identification of structure transformation of monolayer ReS₂ induced by strain is greatly lacking. In this work, the Raman spectra of monolayer ReS₂ with external strain are determined theoretically based on the density function theory. Due to the lower structural symmetry, deformation induced by external strain can only regulate the Raman mode intensity but cannot lead to Raman mode shifts. Our calculations suggest that structural deformation induced by external strain can be identified by Raman scattering.