Fig. 1: Structure and the overall Raman spectrum of CrGrTe3.
From: Spontaneously formed phonon frequency combs in van der Waals solid CrGeTe3 and CrSiTe3
a Crystal structure of CrGeTe3 in the hexagonal lattice unit. The Te atoms are not drawn. A rhombohedral lattice unit is drawn inside the hexagonal lattice unit. b The rhombohedral primitive cell of CrGeTe3. c Overall Raman spectrum of CrGeTe3 in parallel (LL) and cross (RL) circularly polarized channels.
