Helicity-Selective Electron-Phonon Coupling Between $PT$-Partner States in $2H$-bilayer MoS$_2$

Fred Sun; Jia-An Yan

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arXiv · 2610.34830

Helicity-Selective Electron-Phonon Coupling Between $PT$-Partner States in $2H$-bilayer MoS$_2$

Fred Sun·Jia-An Yan

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Abstract

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.

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Fred Sun, Jia-An Yan. 2026-10-26. Helicity-Selective Electron-Phonon Coupling Between $PT$-Partner States in $2H$-bilayer MoS$_2$. https://arxiv.org/abs/2610.34830

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