Superconducting proximity effect and possible evidence for Pearl vortices in a candidate topological insulator

Duming Zhang, Jian Wang, Ashley M. Dasilva, Joon Sue Lee, Humberto R. Gutierrez, Moses H.W. Chan, Jainendra Jain, Nitin Samarth

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117 Scopus citations

Abstract

We report the observation of the superconducting proximity effect in nanoribbons of a candidate topological insulator (Bi2Se3), which is interfaced with superconducting (tungsten) contacts. We observe a supercurrent and multiple Andreev reflections for channel lengths that are much longer than the inelastic and diffusive thermal lengths deduced from normal-state transport. This suggests that the proximity effect couples preferentially to a ballistic surface transport channel, even in the presence of a coexisting diffusive bulk channel. When a magnetic field is applied perpendicular to the plane of the nanoribbon, we observe magnetoresistance oscillations that are periodic in magnetic field. Quantitative comparison with a model of vortex blockade relates the occurrence of these oscillations to the formation of Pearl vortices in the region of proximity-induced superconductivity.

Original languageEnglish (US)
Article number165120
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number16
DOIs
StatePublished - Oct 24 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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