Chiral phonons have been identified in several chiral crystals, primarily in crystals with trigonal symmetry and threefold screw axes. In this study, chiral phonons in ${\mathrm{CrSi}}_2$, a chiral crystal with a sixfold helical structure, were investigated. Circularly polarized Raman spectroscopy revealed a subtle splitting of doubly degenerate $E_2$ phonon modes between cross-circular polarization configurations. These observations, supported by first-principles phonon calculations, indicate the presence of chiral phonons in ${\mathrm{CrSi}}_2$, expanding the scope of materials that exhibit chiral vibrational modes beyond the conventional trigonal class.

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• Phonons
• Chiral symmetry
• Density functional calculations
• Raman spectroscopy