Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/152378
Title: Chiral phonons and giant magneto-optical effect in CrBr₃ 2D magnet
Authors: Yin, Tingting
Ulman, Kanchan Ajit
Liu, Sheng
Granados Del Águila, Andrés
Huang, Yuqing
Zhang, Lifa
Serra, Marco
Sedmidubsky, David
Sofer, Zdenek
Quek, Su Ying
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2021
Source: Yin, T., Ulman, K. A., Liu, S., Granados Del Águila, A., Huang, Y., Zhang, L., Serra, M., Sedmidubsky, D., Sofer, Z., Quek, S. Y. & Xiong, Q. (2021). Chiral phonons and giant magneto-optical effect in CrBr₃ 2D magnet. Advanced Materials, 33(36), 2101618-. https://dx.doi.org/10.1002/adma.202101618
Project: NRF-CRP-21-2018-0007
MOE2016-T2-2-132
MOE2017-T2-2-139
Journal: Advanced Materials
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.
URI: https://hdl.handle.net/10356/152378
ISSN: 0935-9648
DOI: 10.1002/adma.202101618
Rights: This is the peer reviewed version of the following article: Yin, T., Ulman, K. A., Liu, S., Granados Del Águila, A., Huang, Y., Zhang, L., Serra, M., Sedmidubsky, D., Sofer, Z., Quek, S. Y. & Xiong, Q. (2021). Chiral phonons and giant magneto-optical effect in CrBr₃ 2D magnet. Advanced Materials, 33(36), 2101618-, which has been published in final form at https://dx.doi.org/10.1002/adma.202101618. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20220914
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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  Until 2022-09-14
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