Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-06-18
Phys. Rev. B 84, 165120 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Submitted to Physical Review B (regular article)
Scientific paper
10.1103/PhysRevB.84.165120
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.
Chan Moses H. W.
DaSilva Ashley M.
Gutierrez Humberto R.
Jain Jainendra
Lee Joon Sue
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