Pseudogap and Fermi arc induced by Fermi surface nesting in a centrosymmetric skyrmion magnet

• 成果类型: Article
• 署名作者: Dong, Yuyang; Kinoshita, Yuto; Ochi, Masayuki; Nakachi, Ryu; Higashinaka, Ryuji; Hayami, Satoru; Wan, Yuxuan; Arai, Yosuke; Huh, Soonsang; Hashimoto, Makoto; Lu, Donghui; Tokunaga, Masashi; Aoki, Yuji; Matsuda, Tatsuma D.; Kondo, Takeshi
• 署名单位: University of Tokyo; University of Osaka; University of Osaka; Tokyo Metropolitan University; Hokkaido University; Stanford University; United States Department of Energy (DOE); SLAC National Accelerator Laboratory; University of Tokyo
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9923
• DOI: 10.1126/science.adj7710
• 发表日期: 2025-05-08
• 页码: 624-630
• 关键词: lattice

摘要

Skyrmions in noncentrosymmetric materials are believed to occur due to the Dzyaloshinskii-Moriya interaction. By contrast, the skyrmion formation mechanism in centrosymmetric materials remains elusive. Here, we reveal the intrinsic electronic structure of the centrosymmetric GdRu2Si2 by selectively measuring magnetic domains using angle-resolved photoemission spectroscopy (ARPES). We found robust Fermi surface (FS) nesting, consistent with the magnetic modulation q-vector detected by the previous resonant x-ray scattering measurements. The pseudogap opens at the nested FS portions, which vary for different magnetic domains. The anomalous pseudogap disconnects the FS to generate Fermi arcs with twofold symmetry. These results indicate that the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction plays a decisive role in generating the screw spin modulation responsible for the skyrmion formation in GdRu2Si2. Furthermore, we demonstrate the flexible nature of magnetism in GdRu2Si2 by manipulating magnetic domains with magnetic field and temperature cyclings, providing potential future applications for data storage and processing devices.