Andreev reflection at the superconductor–two-dimensional-electron-gas interface by a quantum point contact
Hideaki Takayanagi, Tatsushi Akazaki
DOI 10.1103/PhysRevB.52.R8633 · Physical Review B
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Abstract
Andreev reflection in a split-gate-fitted superconductor–normal-metal–superconductor junction is studied with retro property of Andreev reflection. As the normal metal, the junction uses a two-dimensional electron gas (2DEG) in a semiconductor heterostructure in the ballistic-transport regime. The differential resistance-voltage characteristics, measured as a function of gate voltage, show a clear change from current-deficit to excess-current characteristics. This change is attributed to the Andreev-reflected holes being focused on the quantum point contact defined in the 2DEG by the split gate.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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