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Title: Kondo Signatures of a Quantum Magnetic Impurity in Topological Superconductors

Abstract

We investigate the Kondo physics of a quantum magnetic impurity in two-dimensional topological superconductors (TSCs), either intrinsic or induced on the surface of a bulk topological insulator, using a numerical renormalization group technique. We show that, despite sharing the $$\mathcal{p + ip}$$ pairing symmetry, intrinsic and extrinsic TSCs host different physical processes that produce distinct Kondo signatures. Extrinsic TSCs harbor an unusual screening mechanism involving both electron and orbital degrees of freedom that produces rich and prominent Kondo phenomena, especially an intriguing pseudospin Kondo singlet state in the superconducting gap and a spatially anisotropic spin correlation. In sharp contrast, intrinsic TSCs support a robust impurity spin doublet ground state and an isotropic spin correlation. These results advance fundamental knowledge of novel Kondo phenomena in TSCs and suggest experimental avenues for their detection and distinction.

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [4];  [5];  [6];  [7]
  1. Shanghai Jiao Tong Univ. (China); Nanjing Univ. (China); Collaborative Innovation Center for Advanced Microstructures, Nanjing (China)
  2. Nanjing Univ. (China); Sichuan Nomal Univ., Chengdu (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Houston, Houston, TX (United States)
  5. Univ. of Nevada, Las Vegas, NV (United States)
  6. Nanjing Univ. (China); Collaborative Innovation Center for Advanced Microstructures, Nanjing (China)
  7. Shanghai Jiao Tong Univ. (China); Collaborative Innovation Center for Advanced Microstructures, Nanjing (China); Beijing Computational Science Research Center, Beijing (China)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1508562
Alternate Identifier(s):
OSTI ID: 1546390
Report Number(s):
LA-UR-19-21537
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
89233218CNA000001; LANLE3B5; 2016YFA0300501; 2017YFA0303200; 2012CB921704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science

Citation Formats

Wang, Rui, Su, W., Zhu, Jian-Xin, Ting, C. S., Li, Hai, Chen, Changfeng, Wang, Baigeng, and Wang, Xiaoqun. Kondo Signatures of a Quantum Magnetic Impurity in Topological Superconductors. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.087001.
Wang, Rui, Su, W., Zhu, Jian-Xin, Ting, C. S., Li, Hai, Chen, Changfeng, Wang, Baigeng, & Wang, Xiaoqun. Kondo Signatures of a Quantum Magnetic Impurity in Topological Superconductors. United States. doi:10.1103/PhysRevLett.122.087001.
Wang, Rui, Su, W., Zhu, Jian-Xin, Ting, C. S., Li, Hai, Chen, Changfeng, Wang, Baigeng, and Wang, Xiaoqun. Fri . "Kondo Signatures of a Quantum Magnetic Impurity in Topological Superconductors". United States. doi:10.1103/PhysRevLett.122.087001. https://www.osti.gov/servlets/purl/1508562.
@article{osti_1508562,
title = {Kondo Signatures of a Quantum Magnetic Impurity in Topological Superconductors},
author = {Wang, Rui and Su, W. and Zhu, Jian-Xin and Ting, C. S. and Li, Hai and Chen, Changfeng and Wang, Baigeng and Wang, Xiaoqun},
abstractNote = {We investigate the Kondo physics of a quantum magnetic impurity in two-dimensional topological superconductors (TSCs), either intrinsic or induced on the surface of a bulk topological insulator, using a numerical renormalization group technique. We show that, despite sharing the $\mathcal{p + ip}$ pairing symmetry, intrinsic and extrinsic TSCs host different physical processes that produce distinct Kondo signatures. Extrinsic TSCs harbor an unusual screening mechanism involving both electron and orbital degrees of freedom that produces rich and prominent Kondo phenomena, especially an intriguing pseudospin Kondo singlet state in the superconducting gap and a spatially anisotropic spin correlation. In sharp contrast, intrinsic TSCs support a robust impurity spin doublet ground state and an isotropic spin correlation. These results advance fundamental knowledge of novel Kondo phenomena in TSCs and suggest experimental avenues for their detection and distinction.},
doi = {10.1103/PhysRevLett.122.087001},
journal = {Physical Review Letters},
number = 8,
volume = 122,
place = {United States},
year = {2019},
month = {3}
}

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