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
DOI 10.1103/PhysRevB.84.165120 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | zero_resistance |
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