Abstract

Helicity-resolved Raman spectroscopy (HRRS) can effectively distinguish the Raman modes of two-dimensional (2D) layered materials by phonon symmetry. In this paper, we systematically investigated the phonon helicity selection of basal and edge planes of MoS₂ bulk by HRRS. We find that the symmetry of the crystal structure changes the helicity selection of the E_1g, E¹_2g, and A_1g modes in the edge plane. The theoretical calculation results confirm that the E¹_2g and A_1g modes of the basal plane exhibit a perfect helicity exchange, and the helicity selections of the E¹_2g and A_1g modes of the edge plane are eliminated or weakened. Our study provides references for phonon helicity selection of 2D layered materials represented by MoS₂.

© 2023 Optica Publishing Group

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