Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Junction Fabricated by Ion-Beam Techniques
Abstract
Inducing superconductivity in a topological insulator can lead to novel quantum effects. However, experimental approaches to turn a topological insulator into a superconductor are limited. Here, we report on superconductivity in topological insulator Bi0.91Sb0.09 induced via focused ion-beam deposition of a Pt thin film. The superconducting phase exhibits a Berezinski-Kosterlitz-Thouless transition, demonstrative of its two-dimensional character. From the in-plane upper critical field measurements, we estimate the superconducting thickness to be ~17 nm for a 5.5-μm-thick sample. Our results provide evidence that the interface superconductivity could originate from the surface states of Bi0.91Sb0.09.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
- OSTI Identifier:
- 1465266
- Alternate Identifier(s):
- OSTI ID: 1460484; OSTI ID: 1506337
- Report Number(s):
- LLNL-JRNL-746859
Journal ID: ISSN 0031-9007; PRLTAO; 931609; TRN: US1902459
- Grant/Contract Number:
- AC52-07NA27344; 15-LW-018; 16-SI-004; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 3; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BKT transition; conductivity; impurities in superconductors; superconducting fluctuations; superconducting phase transition; topological insulators; bilayer films; low-temperature superconductors; topological superconductors
Citation Formats
Qu, Dong-Xia, Teslich, Nick E., Dai, Zurong, Chapline, George F., Schenkel, Thomas, Durham, Sean R., and Dubois, Jonathan. Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques. United States: N. p., 2018.
Web. doi:10.1103/PhysRevLett.121.037001.
Qu, Dong-Xia, Teslich, Nick E., Dai, Zurong, Chapline, George F., Schenkel, Thomas, Durham, Sean R., & Dubois, Jonathan. Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques. United States. https://doi.org/10.1103/PhysRevLett.121.037001
Qu, Dong-Xia, Teslich, Nick E., Dai, Zurong, Chapline, George F., Schenkel, Thomas, Durham, Sean R., and Dubois, Jonathan. Mon .
"Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques". United States. https://doi.org/10.1103/PhysRevLett.121.037001. https://www.osti.gov/servlets/purl/1465266.
@article{osti_1465266,
title = {Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques},
author = {Qu, Dong-Xia and Teslich, Nick E. and Dai, Zurong and Chapline, George F. and Schenkel, Thomas and Durham, Sean R. and Dubois, Jonathan},
abstractNote = {Inducing superconductivity in a topological insulator can lead to novel quantum effects. However, experimental approaches to turn a topological insulator into a superconductor are limited. Here, we report on superconductivity in topological insulator Bi0.91Sb0.09 induced via focused ion-beam deposition of a Pt thin film. The superconducting phase exhibits a Berezinski-Kosterlitz-Thouless transition, demonstrative of its two-dimensional character. From the in-plane upper critical field measurements, we estimate the superconducting thickness to be ~17 nm for a 5.5-μm-thick sample. Our results provide evidence that the interface superconductivity could originate from the surface states of Bi0.91Sb0.09.},
doi = {10.1103/PhysRevLett.121.037001},
journal = {Physical Review Letters},
number = 3,
volume = 121,
place = {United States},
year = {2018},
month = {7}
}
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