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PreprintarXiv licencearXiv

Phonon chirality as an additive control of CISS: a symmetry-protected law

  • Shi-Qi Zhang
  • Vipul Upadhyay
  • Jiayue Han
  • Amikam Levy
  • Wenjie Dou
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Abstract

Chirality-induced spin selectivity (CISS) is usually associated with molecular handedness. The possible contribution of chiral phonons is less established. We study a helical tight-binding model in which local phonon angular momentum modulates spin-dependent nearest-neighbor hopping. Fewest-switches surface hopping calculations give the transmitted spin polarization SP=aC+bPH. Here C is the molecular chirality and PH is the phonon chirality. A mirror symmetry reverses C, PH, and SP simultaneously. This symmetry excludes both a chirality-independent offset and a C·PH term. The phonon contribution can therefore enhance, cancel, or reverse the molecular CISS signal.

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Cite

BibTeXRIS
BibTeX
@misc{zhang2026phonon,
  title = {{Phonon chirality as an additive control of CISS: a symmetry-protected law}},
  author = {Shi-Qi Zhang and Vipul Upadhyay and Jiayue Han and Amikam Levy and Wenjie Dou},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.21198},
  eprint = {2609.21198},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.21198},
}
RIS
TY  - UNPB
TI  - Phonon chirality as an additive control of CISS: a symmetry-protected law
AU  - Shi-Qi Zhang
AU  - Vipul Upadhyay
AU  - Jiayue Han
AU  - Amikam Levy
AU  - Wenjie Dou
PY  - 2026
DA  - 2026/09/18
PB  - arXiv
DO  - 10.48550/arxiv.2609.21198
UR  - https://arxiv.org/abs/2609.21198
AB  - Chirality-induced spin selectivity (CISS) is usually associated with molecular handedness. The possible contribution of chiral phonons is less established. We study a helical tight-binding model in which local phonon angular momentum modulates spin-dependent nearest-neighbor hopping. Fewest-switches surface hopping calculations give the transmitted spin polarization SP=aC+bPH. Here C is the molecular chirality and PH is the phonon chirality. A mirror symmetry reverses C, PH, and SP simultaneously. This symmetry excludes both a chirality-independent offset and a C·PH term. The phonon contribution can therefore enhance, cancel, or reverse the molecular CISS signal.
ER  -