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PreprintarXiv licencearXiv

Helicity-Selective Electron-Phonon Coupling Between PT-Partner States in 2H-bilayer MoS2

  • Fred Sun
  • Jia-An Yan
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Abstract

Rotational symmetry (Cn) constrains chiral phonons, but how other symmetries affect their interactions remains largely unexplored. We perform a theoretical and computational study of chiral phonon coupling to parity-time (PT)-degenerate electron doublets in 2H-bilayer MoS2. Although PT suppresses phonon singlet chirality, chiral phonon doublets can helically interact with PT-partner electronic states via a mechanism similar to pseudospin. Selection rules are then analyzed with the interplay of PT and C3. Our computational results of 2H-bilayer MoS2 suggest chiral phonons may be used to resolve intravalley electronic states in PT systems.

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Cite

BibTeXRIS
BibTeX
@misc{sun2026helicityselective,
  title = {{Helicity-Selective Electron-Phonon Coupling Between $PT$-Partner States in $2H$-bilayer MoS$_2$}},
  author = {Fred Sun and Jia-An Yan},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.34830},
  eprint = {2610.34830},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.34830},
}
RIS
TY  - UNPB
TI  - Helicity-Selective Electron-Phonon Coupling Between PT-Partner States in 2H-bilayer MoS_2
AU  - Fred Sun
AU  - Jia-An Yan
PY  - 2026
DA  - 2026/10/26
PB  - arXiv
DO  - 10.48550/arxiv.2610.34830
UR  - https://arxiv.org/abs/2610.34830
AB  - Rotational symmetry (C_n) constrains chiral phonons, but how other symmetries affect their interactions remains largely unexplored. We perform a theoretical and computational study of chiral phonon coupling to parity-time (PT)-degenerate electron doublets in 2H-bilayer MoS_2. Although PT suppresses phonon singlet chirality, chiral phonon doublets can helically interact with PT-partner electronic states via a mechanism similar to pseudospin. Selection rules are then analyzed with the interplay of PT and C_3. Our computational results of 2H-bilayer MoS_2 suggest chiral phonons may be used to resolve intravalley electronic states in PT systems.
ER  -