Nonlinear optical diode effect in a magnetic Weyl semimetal

Tzschaschel, C.; Qiu, J.-X.; Gao, X.-J.; Li, H.-C.; Guo, C.; Yang, H.-Y.; Zhang, C.-P.; Xie, Y.-M.; Liu, Y.-F.; Gao, A.; Bérubé, D.; Dinh, T.; Ho, S.-C.; Fang, Y.; Huang, F.; Nordlander, J.; Ma, Q.; Tafti, F.; Moll, P. J. W.; Law, K. T.; Xu, S.-Y.

doi:10.1038/s41467-024-47291-8

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Nonlinear optical diode effect in a magnetic Weyl semimetal

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Guo, C.
Microstructured Quantum Matter Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Laboratory of Quantum Materials (QMAT), Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL);

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Moll, P. J. W.
Microstructured Quantum Matter Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Laboratory of Quantum Materials (QMAT), Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL);

Externe Ressourcen

https://arxiv.org/abs/2307.15603
(Preprint)

https://doi.org/10.1038/s41467-024-47291-8
(Verlagsversion)

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Zitation

Tzschaschel, C., Qiu, J.-X., Gao, X.-J., Li, H.-C., Guo, C., Yang, H.-Y., et al. (2024). Nonlinear optical diode effect in a magnetic Weyl semimetal. Nature Communications, 15(1): 3017. doi:10.1038/s41467-024-47291-8.

Zitierlink: https://hdl.handle.net/21.11116/0000-000D-82BC-C

Zusammenfassung

Diode effects are of great interest for both fundamental physics and modern technologies. Electrical diode effects (nonreciprocal transport) have been observed in Weyl systems. Optical diode effects arising from the Weyl fermions have been theoretically considered but not probed experimentally. Here, we report the observation of a nonlinear optical diode effect (NODE) in the magnetic Weyl semimetal CeAlSi, where the magnetization introduces a pronounced directionality in the nonlinear optical second-harmonic generation (SHG). We demonstrate a six-fold change of the measured SHG intensity between opposite propagation directions over a bandwidth exceeding 250 meV. Supported by density-functional theory, we establish the linearly dispersive bands emerging from Weyl nodes as the origin of this broadband effect. We further demonstrate current-induced magnetization switching and thus electrical control of the NODE. Our results advance ongoing research to identify novel nonlinear optical/transport phenomena in magnetic topological materials and further opens new pathways for the unidirectional manipulation of light.