Exciton-activated effective phonon magnetic moment in monolayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>MoS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Chunli Tang, Gaihua Ye, Cynthia Nnokwe, Mengqi Fang, Li Xiang, Masoud Mahjouri‐Samani, Dmitry Smirnov, Eui‐Hyeok Yang, Tingting Wang, Lifa Zhang, Rui He, Wencan Jin
Abstract
Chiral phonons are lattice vibration modes in which the atomic circular motions produce nonzero angular momentum. In monolayer MoS${}_{2}$, the authors demonstrate here a chiral phonon mode at ~270 cm${}^{\ensuremath{-}1}$ that is activated by resonant excitation of the bright exciton. Under an out-of-plane magnetic field, this mode exhibits large Zeeman splitting, which corresponds to an effective magnetic moment of ~2.5 \ensuremath{\mu}${}_{B}$. This study will stimulate research on the effective magnetic moments that emerge from the interplay between chiral phonons and the valley degree of freedom.