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Open Access Publications from the University of California

Spin-orbit quantum impurity in a topological magnet.

  • Author(s): Yin, Jia-Xin
  • Shumiya, Nana
  • Jiang, Yuxiao
  • Zhou, Huibin
  • Macam, Gennevieve
  • Sura, Hano Omar Mohammad
  • Zhang, Songtian S
  • Cheng, Zi-Jia
  • Guguchia, Zurab
  • Li, Yangmu
  • Wang, Qi
  • Litskevich, Maksim
  • Belopolski, Ilya
  • Yang, Xian P
  • Cochran, Tyler A
  • Chang, Guoqing
  • Zhang, Qi
  • Huang, Zhi-Quan
  • Chuang, Feng-Chuan
  • Lin, Hsin
  • Lei, Hechang
  • Andersen, Brian M
  • Wang, Ziqiang
  • Jia, Shuang
  • Hasan, M Zahid
  • et al.

Quantum states induced by single-atomic impurities are at the frontier of physics and material science. While such states have been reported in high-temperature superconductors and dilute magnetic semiconductors, they are unexplored in topological magnets which can feature spin-orbit tunability. Here we use spin-polarized scanning tunneling microscopy/spectroscopy (STM/S) to study the engineered quantum impurity in a topological magnet Co3Sn2S2. We find that each substituted In impurity introduces a striking localized bound state. Our systematic magnetization-polarized probe reveals that this bound state is spin-down polarized, in lock with a negative orbital magnetization. Moreover, the magnetic bound states of neighboring impurities interact to form quantized orbitals, exhibiting an intriguing spin-orbit splitting, analogous to the splitting of the topological fermion line. Our work collectively demonstrates the strong spin-orbit effect of the single-atomic impurity at the quantum level, suggesting that a nonmagnetic impurity can introduce spin-orbit coupled magnetic resonance in topological magnets.

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