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Lattice structure and symmetry of two-dimensional (2D) layered materials areof key importance to their fundamental mechanical, thermal, electronic andoptical properties. Raman spectroscopy, as a convenient and nondestructivetool, however has its limitations on identifying all symmetry allowing Ramanmodes and determining the corresponding crystal structure of 2D layeredmaterials with high symmetry like graphene and MoS2. Due to lower structuralsymmetry and extraordinary weak interlayer coupling of ReS2, we successfullyidentified all 18 first-order Raman active modes for bulk and monolayer ReS2.Without van der Waals (vdW) correction, our local density approximation (LDA)calculations successfully reproduce all the Raman modes. Our calculations alsosuggest no surface reconstruction effect and the absence of low frequencyrigid-layer Raman modes below 100 cm-1. Combining with Raman and LDA thusprovides a general approach for studying the vibrational and structuralproperties of 2D layered materials with lower symmetry.

Raman vibrational spectra of bulk to monolayer ReS2 with lower symmetry