Magnetic and defect probes of the SmB6 surface state

Jiao, Lin; Rößler, Sahana; Kasinathan, Deepa; Rosa, Priscila F.  S.; Guo, Chunyu; Yuan, Huiqiu; Liu, Chao-Xing; Fisk, Zachary; Steglich, Frank; Wirth, Steffen

doi:10.1126/sciadv.aau4886

Title: Magnetic and defect probes of the SmB₆ surface state

Journal Article · 08 November 2018 · Science Advances

DOI: https://doi.org/10.1126/sciadv.aau4886 · OSTI ID:1483546

Jiao, Lin ^[1]; Rößler, Sahana ^[1];

^[1]; Rosa, Priscila F. S. ^[2]; Guo, Chunyu ^[3]; Yuan, Huiqiu ^[4];

^[5]; Fisk, Zachary ^[6]; Steglich, Frank ^[7];

^[1]

Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Zhejiang Univ., Hangzhou (China). Center for Correlated Matter. Dept. of Physics
Zhejiang Univ., Hangzhou (China). Center for Correlated Matter. Dept. of Physics; Nanjing Univ. (China). Collaborative Innovation Center of Advanced Microstructures
Pennsylvania State Univ., University Park, PA (United States). Dept. of Physics
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany); Zhejiang Univ., Hangzhou (China). Center for Correlated Matter; Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics

The impact of nonmagnetic and magnetic impurities on topological insulators is a central focus concerning their fundamental physics and possible spintronics and quantum computing applications. Combining scanning tunneling spectroscopy with transport measurements, we investigate, both locally and globally, the effect of nonmagnetic and magnetic substituents in SmB₆, a predicted topological Kondo insulator. Around the so-introduced substitutents and in accord with theoretical predictions, the surface states are locally suppressed with different length scales depending on the substituent’s magnetic properties. For sufficiently high substituent concentrations, these states are globally destroyed. Similarly, using a magnetic tip in tunneling spectroscopy also resulted in largely suppressed surface states. Hence, a destruction of the surface states is always observed close to atoms with substantial magnetic moment. This points to the topological nature of the surface states in SmB₆ and illustrates how magnetic impurities destroy the surface states from microscopic to macroscopic length scales.

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Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: Alexander von Humboldt Foundation (Germany); German Research Foundation (DFG); LANL Laboratory Directed Research and Development (LDRD) Program; National Key R&D Program of China; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF) (United States); Office of Naval Research (ONR) (United States); Science Challenge Project of China; USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1483546

Report Number(s):: LA-UR-18-28715

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 11 Vol. 4; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Inorganic Boron-Based Nanostructures: Synthesis, Optoelectronic Properties, and Prospective Applications Tian, Yan; Guo, Zekun; Zhang, Tong Nanomaterials, Vol. 9, Issue 4 https://doi.org/10.3390/nano9040538	journal	April 2019
Transport gap in SmB ₆ protected against disorder Eo, Yun Suk; Rakoski, Alexa; Lucien, Juniar Proceedings of the National Academy of Sciences, Vol. 116, Issue 26 https://doi.org/10.1073/pnas.1901245116	journal	June 2019
Surface resonance of the ( 2 × 1 ) reconstructed lanthanum hexaboride (001)-cleavage plane: A combined STM and DFT study Buchsteiner, P.; Sohn, F.; Horstmann, J. G. Physical Review B, Vol. 100, Issue 20 https://doi.org/10.1103/physrevb.100.205407	journal	November 2019
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Quantum Oscillations in Flux-Grown SmB 6 with Embedded Aluminum Thomas, S. M.; Ding, Xiaxin; Ronning, F. Physical Review Letters, Vol. 122, Issue 16 https://doi.org/10.1103/physrevlett.122.166401	journal	April 2019
Inorganic Boron-Based Nanostructures: Synthesis, Optoelectronic Properties, and Prospective Applications Tian, Yan; Guo, Zekun; Zhang, Tong Nanomaterials, Vol. 9, Issue 4 https://doi.org/10.3390/nano9040538	journal	April 2019

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