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Open Access Publications from the University of California

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

  • Author(s): Qu, DX
  • Teslich, NE
  • Dai, Z
  • Chapline, GF
  • Schenkel, T
  • Durham, SR
  • Dubois, J
  • et al.

© 2018 American Physical Society. 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.

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