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

Fred Sun; Jia-An Yan

paper

Helicity-Selective Electron-Phonon Coupling Between $P T$ -Partner States in $2 H$ -bilayer MoS $_{2}$

arXiv:2610.34830

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 ( $P T$ )-degenerate electron doublets in $2 H$ -bilayer MoS $_{2}$ . Although $P T$ suppresses phonon singlet chirality, chiral phonon doublets can helically interact with $P T$ -partner electronic states via a mechanism similar to pseudospin. Selection rules are then analyzed with the interplay of $P T$ and $C_{3}$ . Our computational results of $2 H$ -bilayer MoS $_{2}$ suggest chiral phonons may be used to resolve intravalley electronic states in $P T$ systems.

arXiv comment8 pages, 5 figures, with supplementary information

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

Abstract

Helicity-Selective Electron-Phonon Coupling Between $P T$ -Partner States in $2 H$ -bilayer MoS $_{2}$