Spin-orbit quantum impurity in a topological magnet

Jia-Xin Yin (), Nana Shumiya, Yuxiao Jiang, Huibin Zhou, Gennevieve Macam, Hano Omar Mohammad Sura, Songtian S. Zhang, Zi-Jia Cheng, Zurab Guguchia, Yangmu Li, Qi Wang, Maksim Litskevich, Ilya Belopolski, Xian P. Yang, Tyler A. Cochran, Guoqing Chang, Qi Zhang, Zhi-Quan Huang, Feng-Chuan Chuang, Hsin Lin, Hechang Lei, Brian M. Andersen, Ziqiang Wang, Shuang Jia and M. Zahid Hasan ()
Additional contact information
Jia-Xin Yin: Princeton University
Nana Shumiya: Princeton University
Yuxiao Jiang: Princeton University
Huibin Zhou: Peking University
Gennevieve Macam: National Sun Yat-sen University
Hano Omar Mohammad Sura: University of Copenhagen
Songtian S. Zhang: Princeton University
Zi-Jia Cheng: Princeton University
Zurab Guguchia: Princeton University
Yangmu Li: Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory
Qi Wang: Renmin University of China
Maksim Litskevich: Princeton University
Ilya Belopolski: Princeton University
Xian P. Yang: Princeton University
Tyler A. Cochran: Princeton University
Guoqing Chang: Princeton University
Qi Zhang: Princeton University
Zhi-Quan Huang: National Sun Yat-sen University
Feng-Chuan Chuang: National Sun Yat-sen University
Hsin Lin: Institute of Physics, Academia Sinica
Hechang Lei: Renmin University of China
Brian M. Andersen: University of Copenhagen
Ziqiang Wang: Boston College
Shuang Jia: Peking University
M. Zahid Hasan: Princeton University

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-18111-6

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