TY - JOUR
T1 - Exciton-activated effective phonon magnetic moment in monolayer MoS2
AU - Tang, Chunli
AU - Ye, Gaihua
AU - Nnokwe, Cynthia
AU - Fang, Mengqi
AU - Xiang, Li
AU - Mahjouri-Samani, Masoud
AU - Smirnov, Dmitry
AU - Yang, Eui Hyeok
AU - Wang, Tingting
AU - Zhang, Lifa
AU - He, Rui
AU - Jin, Wencan
N1 - Publisher Copyright:
© 2024 American Physical Society.
PY - 2024/4/15
Y1 - 2024/4/15
N2 - Optical excitation of chiral phonons plays a vital role in studying the phonon-driven magnetic phenomena in solids. Transition metal dichalcogenides host chiral phonons at high symmetry points of the Brillouin zone, providing an ideal platform to explore the interplay between chiral phonons and valley degree of freedom. Here, we investigate the helicity-resolved magneto-Raman response of monolayer MoS2 and identify a doubly degenerate Brillouin-zone-center chiral phonon mode at ∼270cm-1. Our wavelength- and temperature-dependent measurements show that this chiral phonon is activated through the resonant excitation of A exciton. Under an out-of-plane magnetic field, the chiral phonon exhibits giant Zeeman splitting, which corresponds to an effective magnetic moment of ∼2.5μB. Moreover, we carry out theoretical calculations based on the morphic effects in nonmagnetic crystals, which reproduce the linear Zeeman splitting and Raman cross section of the chiral phonon. Our study provides important insights into lifting the chiral phonon degeneracy in an achiral covalent material, paving a route to excite and control chiral phonons.
AB - Optical excitation of chiral phonons plays a vital role in studying the phonon-driven magnetic phenomena in solids. Transition metal dichalcogenides host chiral phonons at high symmetry points of the Brillouin zone, providing an ideal platform to explore the interplay between chiral phonons and valley degree of freedom. Here, we investigate the helicity-resolved magneto-Raman response of monolayer MoS2 and identify a doubly degenerate Brillouin-zone-center chiral phonon mode at ∼270cm-1. Our wavelength- and temperature-dependent measurements show that this chiral phonon is activated through the resonant excitation of A exciton. Under an out-of-plane magnetic field, the chiral phonon exhibits giant Zeeman splitting, which corresponds to an effective magnetic moment of ∼2.5μB. Moreover, we carry out theoretical calculations based on the morphic effects in nonmagnetic crystals, which reproduce the linear Zeeman splitting and Raman cross section of the chiral phonon. Our study provides important insights into lifting the chiral phonon degeneracy in an achiral covalent material, paving a route to excite and control chiral phonons.
UR - http://www.scopus.com/inward/record.url?scp=85191145245&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85191145245&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.109.155426
DO - 10.1103/PhysRevB.109.155426
M3 - Article
AN - SCOPUS:85191145245
SN - 2469-9950
VL - 109
JO - Physical Review B
JF - Physical Review B
IS - 15
M1 - 155426
ER -