Please use this identifier to cite or link to this item: https://doi.org/10.1002/adma.202101618
Title: Chiral Phonons and Giant Magneto-Optical Effect in CrBr3 2D Magnet
Authors: Yin, Tingting
Ulman, Kanchan Ajit 
Liu, Sheng
del Aguila, Andres Granados
Huang, Yuqing
Zhang, Lifa 
Serra, Marco
Sedmidubsky, David
Sofer, Zdenek
Quek, Su Ying 
Xiong, Qihua
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
chiral phonons
pseudoangular momentum
magneto-optical effect
CrBr
(3) ferromagnet
spin-phonon coupling
RAMAN-SCATTERING
FERROMAGNETISM
SPECTRA
FIELD
MOS2
Issue Date: 24-Jul-2021
Publisher: WILEY-V C H VERLAG GMBH
Citation: Yin, Tingting, Ulman, Kanchan Ajit, Liu, Sheng, del Aguila, Andres Granados, Huang, Yuqing, Zhang, Lifa, Serra, Marco, Sedmidubsky, David, Sofer, Zdenek, Quek, Su Ying, Xiong, Qihua (2021-07-24). Chiral Phonons and Giant Magneto-Optical Effect in CrBr3 2D Magnet. ADVANCED MATERIALS 33 (36). ScholarBank@NUS Repository. https://doi.org/10.1002/adma.202101618
Abstract: Phonons with chirality determine the optical helicity of inelastic light scattering processes due to their nonzero angular momentum. Here it is shown that 2D magnetic CrBr3 hosts chiral phonons at the Brillouin-zone center. These chiral phonons are linear combinations of the doubly-degenerate Eg phonons, and the phonon eigenmodes exhibit clockwise and counterclockwise rotational vibrations corresponding to angular momenta of l = ± 1. Such Eg chiral phonons completely switch the polarization of incident circularly polarized light. On the other hand, the non-degenerate non-chiral Ag phonons display a giant magneto-optical effect under an external out-of-plane magnetic field, rotating the plane of polarization of the scattered linearly polarized light. The corresponding degree of polarization of the scattered light changes from 91% to −68% as the magnetic field strength increases from 0 to 5 T. In contrast, the chiral Eg modes display no field dependence. The results lay a foundation for the study of phonon chirality and magneto-optical phenomena in 2D magnetic materials, as well as their related applications, such as the phonon Hall effect, topological photonics, and Raman lasing.
Source Title: ADVANCED MATERIALS
URI: https://scholarbank.nus.edu.sg/handle/10635/229977
ISSN: 0935-9648
1521-4095
DOI: 10.1002/adma.202101618
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