Work

Chiral phonons in sixfold chiral CrSi 2 : Raman spectroscopy and first-principles calculations

Year: 2026

Type: article

Abstract: Chiral phonons have been identified in several chiral crystals, primarily in those with trigonal symmetry and threefold screw axes. In this study, chiral phonons in 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 CrSi$_2$, expanding the scope of materials that exhibit chiral vibrational modes beyond the conventional trigonal class.

Source: Physical review. B./Physical review. B

DOI: 10.1103/6zdg-1mpt

Authors: Gakuto Kusuno, Shingo Kisanuki, Yusuke Kousaka, Yoshihiko Togawa, Takuya Satoh

Institutions: Institute of Science Tokyo, Osaka Metropolitan University, Institute for Molecular Science

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Japan Science and Technology Corporation, Ministry of Education, Culture, Sports, Science and Technology, Japan Society for the Promotion of Science