Chiral Phonons in a Cubic Lattice
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911111045971968 |
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| author | Tsunetsugu, Hirokazu Kusunose, Hiroaki |
| author_facet | Tsunetsugu, Hirokazu Kusunose, Hiroaki |
| contents | We have developed a theory for the energy dispersion of chiral phonons in a simplest cubic lattice. Among all the phonon modes, only the optical triplet modes exhibit the intrinsic characteristics of chiral phonons near k=0, and we examine their energy splitting in detail by analyzing the dynamical matrix. To first order in k, the splitting is described by a spin-1 Weyl Hamiltonian, and helicity becomes a good quantum number. It asymptotically coincides with the crystal angular momentum for k parallel <111> up to a global sign. The Hamiltonian incorporates a pseudoscalar coupling constant associated with electric toroidal monopoles, determined by the spatial configuration of the stiffness tensors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_13570 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chiral Phonons in a Cubic Lattice Tsunetsugu, Hirokazu Kusunose, Hiroaki Strongly Correlated Electrons We have developed a theory for the energy dispersion of chiral phonons in a simplest cubic lattice. Among all the phonon modes, only the optical triplet modes exhibit the intrinsic characteristics of chiral phonons near k=0, and we examine their energy splitting in detail by analyzing the dynamical matrix. To first order in k, the splitting is described by a spin-1 Weyl Hamiltonian, and helicity becomes a good quantum number. It asymptotically coincides with the crystal angular momentum for k parallel <111> up to a global sign. The Hamiltonian incorporates a pseudoscalar coupling constant associated with electric toroidal monopoles, determined by the spatial configuration of the stiffness tensors. |
| title | Chiral Phonons in a Cubic Lattice |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.13570 |