Journal
PHYSICAL REVIEW B
Volume 84, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.165120
Keywords
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Funding
- Penn State Center for Nanoscale Science
- Pennsylvania State University Materials Research Institute Nanofabrication Lab
- National Science Foundation (NSF) [DMR-0820404, 0335765]
- ONR
- National Nanotechnology Infrastructure Network, with Cornell University
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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.
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