Yu-Shiba-Rusinov States in a Superconductor with Topological Z 2 Bands
Abstract
A Yu-Shiba-Rusinov (YSR) state is a localized in-gap state induced by a magnetic impurity in a superconductor. Recent experiments used an STM tip to manipulate the exchange coupling between an Fe adatom and the superconductor possessing a nontrivial band structure with topological surface states. As the tip moves close to the single Fe adatom, the energy of the in-gap state modulates and exhibits a zero-energy crossing followed by an unusual return to zero energy, which cannot be understood by coupling the magnetic impurity to the superconducting topological surface Dirac cone. Here, we numerically and analytically study the YSR states in superconductors with nontrivial bands and show the emergence of the two zero-energy crossings as a function of the exchange coupling between the magnetic impurity and the bulk states. We analyze the role of the topological surface states and compare in-gap states to systems with trivial bands. The spin polarization of the YSR states is further studied for future experimental measurement.
- Authors:
-
[1];
- RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), Wako (Japan); University of Chinese Academy of Sciences, Beijing (China)
- Boston College, Chestnut Hill, MA (United States)
- Publication Date:
- Research Org.:
- Boston College, Chestnut Hill, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1980293
- Grant/Contract Number:
- FG02-99ER45747
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 128; Journal Issue: 23; 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; Physics; impurities in superconductors; superconductivity; topological superconductors; iron-based superconductors
Citation Formats
Chiu, Ching-Kai, and Wang, Ziqiang. Yu-Shiba-Rusinov States in a Superconductor with Topological Z2 Bands. United States: N. p., 2022.
Web. doi:10.1103/physrevlett.128.237001.
Chiu, Ching-Kai, & Wang, Ziqiang. Yu-Shiba-Rusinov States in a Superconductor with Topological Z2 Bands. United States. https://doi.org/10.1103/physrevlett.128.237001
Chiu, Ching-Kai, and Wang, Ziqiang. Mon .
"Yu-Shiba-Rusinov States in a Superconductor with Topological Z2 Bands". United States. https://doi.org/10.1103/physrevlett.128.237001. https://www.osti.gov/servlets/purl/1980293.
@article{osti_1980293,
title = {Yu-Shiba-Rusinov States in a Superconductor with Topological Z2 Bands},
author = {Chiu, Ching-Kai and Wang, Ziqiang},
abstractNote = {A Yu-Shiba-Rusinov (YSR) state is a localized in-gap state induced by a magnetic impurity in a superconductor. Recent experiments used an STM tip to manipulate the exchange coupling between an Fe adatom and the FeTe0.55Se0.45 superconductor possessing a Z2 nontrivial band structure with topological surface states. As the tip moves close to the single Fe adatom, the energy of the in-gap state modulates and exhibits a zero-energy crossing followed by an unusual return to zero energy, which cannot be understood by coupling the magnetic impurity to the superconducting topological surface Dirac cone. Here, we numerically and analytically study the YSR states in superconductors with nontrivial Z2 bands and show the emergence of the two zero-energy crossings as a function of the exchange coupling between the magnetic impurity and the bulk states. We analyze the role of the topological surface states and compare in-gap states to systems with trivial Z2 bands. The spin polarization of the YSR states is further studied for future experimental measurement.},
doi = {10.1103/physrevlett.128.237001},
journal = {Physical Review Letters},
number = 23,
volume = 128,
place = {United States},
year = {Mon Jun 06 00:00:00 EDT 2022},
month = {Mon Jun 06 00:00:00 EDT 2022}
}
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