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Truly chiral phonons in α-HgS

石戸 享佑 Mao Huiling ZHANG TIANTIAN 村上 修一 佐藤 琢哉 Kyosuke Ishito Huiling Mao Tiantian Zhang Shuichi Murakami Takuya Satoh 東京工業大学 DOI:https://doi.org/10.1038/s41567-022-01790-x

2023.01

概要

Chirality is a manifestation of the asymmetry inherent in nature. It has been defned as the symmetry breaking of the parity of static objects, and the defnition was extended to dynamic motion such that true and false chiralities were distinguished. Recently, rotating, yet not propagating, atomic motions were predicted and observed in two-dimensional materials, and they were referred to as ‘chiral phonons’. A natural development would be the discovery of truly chiral phonons that propagate while rotating in three-dimensional materials. Here we used circularly polarized Raman scattering and frst-principles calculations to identify truly chiral phonons in chiral bulk crystals. This approach enabled us to determine the chirality of a crystal in a non-contact and non-destructive manner. In addition, we demonstrated that the law of the conservation of pseudo-angular momentum holds between circularly polarized photons and chiral phonons. These fndings are expected to help develop ways for transferring the pseudo-angular momentum from photons to electron spins via propagating chiral phonons in opto-phononic-spintronic devices.

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