Spin-chirality-driven second-harmonic generation in two-dimensional magnet CrSBr.

Authors

Dezhao Wu, Yong Xu, Meng Ye, Wenhui Duan

Published in

Science advances. Volume 11. Issue 14. Pages eadu6562. Apr 04, 2025. Epub Apr 04, 2025.

Abstract

The interplay between magnetism and light can create abundant optical phenomena. Here, we demonstrate the emergence of an unconventional magnetization-induced second-harmonic generation (MSHG) stemming from vector spin chirality, denoted as chiral second-harmonic generation (SHG). Taking the antiferromagnetic (AFM) CrSBr bilayer as a prototype, we theoretically show that, via spin canting, the chiral SHG can be continuously tuned from zero to a value one order of magnitude larger than its intrinsic MSHG. Chiral SHG is found to be proportional to spin chirality and spin-canting-induced electric polarization, while intrinsic MSHG is proportional to the Néel vector, demonstrating their different physical mechanisms. Additionally, we reveal a unique interference effect between these two types of MSHG under the reversal of spin-canting direction, generating a giant modulation of SHG signals. Our work not only uncovers a unique SHG with exceptional tunability but also promotes the applications of AFM optical devices and magnetoelectric detection techniques.

PMID:
40184467
Bibliographic data and abstract were imported from PubMed on 05 Apr 2025.

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