Work

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

Year: 2026

Type: preprint

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.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.34830

Authors: Sun, Fred, Yan, Jia-An

Institution: Towson University

Language: English

Topic: 2D Materials and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Towson University, Jess and Mildred Fisher College of Science and Mathematics

OpenAlex ID: W7223844858

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