Quantifying chirality of phonons
Fuente:
arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910121280405504 |
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| author | Huang, Yu-Chi Kusuno, Gakuto Hashimoto, Yusuke Juraschek, Dominik Maximilian Kusunose, Hiroaki Satoh, Takuya |
| author_facet | Huang, Yu-Chi Kusuno, Gakuto Hashimoto, Yusuke Juraschek, Dominik Maximilian Kusunose, Hiroaki Satoh, Takuya |
| contents | Recent years have witnessed growing interest in chiral phonons, lattice vibrations carrying angular momentum and exhibiting handedness, as revealed by helicity-dependent optical phenomena. Despite this progress, a quantitative characterization of phonon chirality as a dynamical property has remained elusive. In this work, we propose a theoretical framework to quantify the dynamical chirality of lattice vibrations. We introduce two quantitative measures: momentum-resolved dynamical chirality, which provides a mode- and wave-vector-resolved picture of phonon chirality, and the bulk dynamical chirality, which characterizes the collective behavior of thermally populated chiral phonons. Using first-principles calculations for both chiral and achiral materials, we demonstrate how these quantities capture the handedness and population imbalance of phonon modes and serve as a means to distinguish the enantiomers of chiral crystals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_10231 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantifying chirality of phonons Huang, Yu-Chi Kusuno, Gakuto Hashimoto, Yusuke Juraschek, Dominik Maximilian Kusunose, Hiroaki Satoh, Takuya Materials Science Recent years have witnessed growing interest in chiral phonons, lattice vibrations carrying angular momentum and exhibiting handedness, as revealed by helicity-dependent optical phenomena. Despite this progress, a quantitative characterization of phonon chirality as a dynamical property has remained elusive. In this work, we propose a theoretical framework to quantify the dynamical chirality of lattice vibrations. We introduce two quantitative measures: momentum-resolved dynamical chirality, which provides a mode- and wave-vector-resolved picture of phonon chirality, and the bulk dynamical chirality, which characterizes the collective behavior of thermally populated chiral phonons. Using first-principles calculations for both chiral and achiral materials, we demonstrate how these quantities capture the handedness and population imbalance of phonon modes and serve as a means to distinguish the enantiomers of chiral crystals. |
| title | Quantifying chirality of phonons |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.10231 |