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Title: Magnetic and defect probes of the SmB 6 surface state

Abstract

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 SmB 6, 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 SmB 6 and illustrates how magnetic impurities destroy the surface states from microscopic to macroscopic length scales.

Authors:
 [1];  [1]; ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [5];  [6];  [7]; ORCiD logo [1]
  1. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  2. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Zhejiang Univ., Hangzhou (China). Center for Correlated Matter. Dept. of Physics
  4. Zhejiang Univ., Hangzhou (China). Center for Correlated Matter. Dept. of Physics; Nanjing Univ. (China). Collaborative Innovation Center of Advanced Microstructures
  5. Pennsylvania State Univ., University Park, PA (United States). Dept. of Physics
  6. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  7. 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
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; LANL Laboratory Directed Research and Development (LDRD) Program; Office of Naval Research (ONR) (United States); National Science Foundation (NSF); German Research Foundation (DFG); Alexander von Humboldt Foundation (Germany); National Key R&D Program of China; National Natural Science Foundation of China (NNSFC); Science Challenge Project of China
OSTI Identifier:
1483546
Report Number(s):
LA-UR-18-28715
Journal ID: ISSN 2375-2548
Grant/Contract Number:  
89233218CNA000001; N00014-15-1-2675; DMR1708199; SPP 1666; 2017YFA0303100; 2016YFA0300202; U1632275; TZ2016004
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 4; Journal Issue: 11; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Material Science

Citation Formats

Jiao, Lin, Rößler, Sahana, Kasinathan, Deepa, Rosa, Priscila F. S., Guo, Chunyu, Yuan, Huiqiu, Liu, Chao-Xing, Fisk, Zachary, Steglich, Frank, and Wirth, Steffen. Magnetic and defect probes of the SmB6 surface state. United States: N. p., 2018. Web. doi:10.1126/sciadv.aau4886.
Jiao, Lin, Rößler, Sahana, Kasinathan, Deepa, Rosa, Priscila F. S., Guo, Chunyu, Yuan, Huiqiu, Liu, Chao-Xing, Fisk, Zachary, Steglich, Frank, & Wirth, Steffen. Magnetic and defect probes of the SmB6 surface state. United States. doi:10.1126/sciadv.aau4886.
Jiao, Lin, Rößler, Sahana, Kasinathan, Deepa, Rosa, Priscila F. S., Guo, Chunyu, Yuan, Huiqiu, Liu, Chao-Xing, Fisk, Zachary, Steglich, Frank, and Wirth, Steffen. Fri . "Magnetic and defect probes of the SmB6 surface state". United States. doi:10.1126/sciadv.aau4886. https://www.osti.gov/servlets/purl/1483546.
@article{osti_1483546,
title = {Magnetic and defect probes of the SmB6 surface state},
author = {Jiao, Lin and Rößler, Sahana and Kasinathan, Deepa and Rosa, Priscila F. S. and Guo, Chunyu and Yuan, Huiqiu and Liu, Chao-Xing and Fisk, Zachary and Steglich, Frank and Wirth, Steffen},
abstractNote = {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.},
doi = {10.1126/sciadv.aau4886},
journal = {Science Advances},
issn = {2375-2548},
number = 11,
volume = 4,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 4 works
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Figures / Tables:

Fig. 1. Fig. 1. : Tunneling spectra with W and Cr tips. Spectra obtained on nonreconstructed surfaces of pure SmB6 by a W tip (red) and a magnetic Cr tip (blue) at 0.35 K and zero magnetic field (Vb = 50 mV; set-point current $I$sp = 200 pA). For comparison, a spectrummore » taken with a W tip at a magnetic field of 12 T is presented (pink, vertically offset by 1 nA/V).« less

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    Works referencing / citing this record:

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.