Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Topological Insulators and Weyl Semimetals (joint session MA/TT)
TT 23.11: Vortrag
Dienstag, 19. März 2024, 12:15–12:30, H 2013
Nonlinear optical diode effect in a magnetic Weyl semimetal — •Christian Tzschaschel1,2, Jian-Xiang Qiu2, Xue-Jian Gao3, Hou-Chen Li2, Chunyu Guo4, Hung-Yu Yang5, Cheng-Ping Zhang3, Ying-Ming Xie3, Yu-Fei Liu2, Anyuan Gao2, Damien Bérubé2, Thao Dinh2, Sheng-Chin Ho2, Yuqiang Fang6,7, Fuqiang Huang6,7, Johanna Nordlander2, Qiong Ma5, Fazel Tafti5, Philip J.W. Moll4, Kam Tuen Law3, and Suyang Xu2 — 1Max Born Institute, Berlin, Germany — 2Harvard University, Cambridge, USA — 3Hong Kong University of Science and Technology, Hong Kong, China — 4Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — 5Boston College, Chestnut Hill, USA — 6Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, China — 7College of Chemistry and Molecular Engineering Peking University, Beijing, China
We report the observation of a nonlinear optical diode effect (NODE) in the magnetic Weyl semimetal CeAlSi, where the magnetic state of CeAlSi introduces a pronounced directionality in the nonlinear optical second-harmonic generation (SHG). By physically reversing the beam path, we observe a strong directional contrast over a wide bandwidth exceeding 250 meV. Supported by first-principles calculations, we establish the linearly dispersive bands emerging from Weyl nodes as the origin of the extreme bandwidth. We further demonstrate current-induced magnetization switching and thus electrical control of the NODE in a spintronic device structure. Our results advance ongoing research to identify novel phenomena in magnetic quantum materials.
Keywords: Weyl; semimetal; nonlinear; SHG