Probing quantum geometric nonlinear magnetization via second-harmonic magneto-optical Kerr effect
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2026
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866908809602007040 |
|---|---|
| author | Qian, Xuan Qiang, Xiao-Bin Zhu, Wenkai Huang, Yuqing Chen, Yiyuan Lu, Hai-Zhou Ji, Yang Wang, Kaiyou |
| author_facet | Qian, Xuan Qiang, Xiao-Bin Zhu, Wenkai Huang, Yuqing Chen, Yiyuan Lu, Hai-Zhou Ji, Yang Wang, Kaiyou |
| contents | Quantum geometry provides an intrinsic framework for characterizing the geometric structure of quantum states. It highlights its relevance to various aspects of fundamental physics. However, its direct implications for magnetic phenomena remain largely unexplored. Here, we report the observation of electric-field-induced nonlinear magnetization in the nonmagnetic semimetal WTe$_2$ by using a second-harmonic magneto-optical Kerr effect (SMOKE) spectroscopy. We observe a robust nonlinear SMOKE signal that scales quadratically with current and persists up to 200 K. Theoretical modeling and scaling analysis indicate that this nonlinear magnetization is dominated by the orbital contribution and is intrinsically linked to the quantum Christoffel symbol. Just as the Christoffel symbol is a fundamental quantity encoding spacetime geometry in Einstein's general relativity, our work establishes a direct link between quantum geometry and nonlinear magnetization, and provides a geometric perspective for designing future orbitronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_03636 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Probing quantum geometric nonlinear magnetization via second-harmonic magneto-optical Kerr effect Qian, Xuan Qiang, Xiao-Bin Zhu, Wenkai Huang, Yuqing Chen, Yiyuan Lu, Hai-Zhou Ji, Yang Wang, Kaiyou Mesoscale and Nanoscale Physics Quantum geometry provides an intrinsic framework for characterizing the geometric structure of quantum states. It highlights its relevance to various aspects of fundamental physics. However, its direct implications for magnetic phenomena remain largely unexplored. Here, we report the observation of electric-field-induced nonlinear magnetization in the nonmagnetic semimetal WTe$_2$ by using a second-harmonic magneto-optical Kerr effect (SMOKE) spectroscopy. We observe a robust nonlinear SMOKE signal that scales quadratically with current and persists up to 200 K. Theoretical modeling and scaling analysis indicate that this nonlinear magnetization is dominated by the orbital contribution and is intrinsically linked to the quantum Christoffel symbol. Just as the Christoffel symbol is a fundamental quantity encoding spacetime geometry in Einstein's general relativity, our work establishes a direct link between quantum geometry and nonlinear magnetization, and provides a geometric perspective for designing future orbitronic devices. |
| title | Probing quantum geometric nonlinear magnetization via second-harmonic magneto-optical Kerr effect |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2602.03636 |