DataVXAdvanced MaterialsPaper
journal article·2021-09Open access

Chiral Phonons and Giant Magneto‐Optical Effect in CrBr3 2D Magnet

Tingting Yin, Kanchan Ajit Ulman, Sheng Liu, Andrés Granados del Águila, Yuqing Huang, Lifa Zhang, Marco Serra, David Sedmidubsky, Zdenek Sofer, Su Ying Quek, Qihua Xiong

Advanced Materials· Volume 33· Issue 36
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Abstract

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.
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Research context

OpenAlex topics: 2D Materials and Applications · Topological Materials and Phenomena · Quantum optics and atomic interactions

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

Centre for Advanced 2D Materials National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore

NNU‐SULI Thermal Energy Research Center and Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing China

University of Chemistry and Technology Prague Technicka 5 Prague 16628 Czech Republic

Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore

NUS Graduate School, Integrative Sciences and Engineering Programme National University of Singapore Singapore 117456 Singapore

Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore

State Key Laboratory of Low‐Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 P. R. China

Beijing Academy of Quantum Information Sciences Beijing 100193 P. R. China

Beijing Innovation Center for Future Chips Tsinghua University Beijing 100084 P. R. China

Funding

National Natural Science Foundation of China · National Research Foundation Singapore · International Cooperation and Exchange Programme

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