Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques

Qu, Dong-Xia; Teslich, Nick E.; Dai, Zurong; Chapline, George F.; Schenkel, Thomas; Durham, Sean R.; Dubois, Jonathan

doi:10.1103/PhysRevLett.121.037001

Title: Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal ${Bi}_{1 - x} {Sb}_{x} / Pt$ Junction Fabricated by Ion-Beam Techniques

Journal Article · 16 July 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.121.037001 · OSTI ID:1465266

Qu, Dong-Xia ^[1]; Teslich, Nick E. ^[1]; Dai, Zurong ^[1]; Chapline, George F. ^[1]; Schenkel, Thomas ^[2]; Durham, Sean R. ^[1]; Dubois, Jonathan ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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 Bi_0.91Sb_0.09 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 Bi_0.91Sb_0.09.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)

Grant/Contract Number:: AC52-07NA27344; 15-LW-018; 16-SI-004; AC02-05CH11231

OSTI ID:: 1465266

Alternate ID(s):: OSTI ID: 1460484; OSTI ID: 1506337

Report Number(s):: LLNL-JRNL-746859; PRLTAO; 931609; TRN: US1902459

Journal Information:: Physical Review Letters, Vol. 121, Issue 3; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi 1 - x Sb x / Pt Junction Fabricated by Ion-Beam Techniques

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Title: Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal ${Bi}_{1 - x} {Sb}_{x} / Pt$ Junction Fabricated by Ion-Beam Techniques