Physics Department - Interwoven Magnetic Kagome Metal Overcoming Geometric Frustration and NanoARPES Facility in SSRF

Abstract
Magnetic kagome materials provide a unique platform for exploring magneto-transport phenomena, symmetry breaking, and charge ordering driven by the intricate interplay among electronic structure, topology, and magnetism. Herein, we introduce a new design strategy for interweaving quasi-1D magnetic Tb zigzag chains with nonmagnetic Ti-based kagome bilayers in TbTi3Bi4. Neutron diffraction, spin-polarized scanning tunneling spectroscopy, and angle-resolved photoemission spectroscopy analyses confirm that the interwoven structure exhibits a coexistent elliptical spiral magnetic order, a spin-density wave, and an unusually large band-folding gap. The combined unique magnetic and electronic state leads to a giant anomalous Hall conductivity of 10⁵ Ω⁻¹cm⁻¹. These results establish TbTi3Bi4 as a model system of magnetic kagome metals with strong electron–magnetic interactions [1]. I would also describe the construction, specifications, capabilities, and operation of BL07U—the NanoARPES endstation at the Shanghai Synchrotron Radiation Facility [2]. I will showcase our research on the electronic structure of emerging graphene devices, with a focus on moiré and flat bands [3] [4] [5].

References
[1] E. J. Cheng et al., arXiv: 2405.16831 (under review)
[2] H. Gao et al., Synchrotron Radiation News 37, 12-17 (2024)
[3] Y. W. Li et al., Advanced Materials 202205996 (2022)
[4] H. B. Xiao et al., Advanced Science 202412609 (2025)
[5] H. B. Xiao et al., Science Bulletin 70, 1030-1033 (2025)