Proximity Effect and Multiple Andreev Reflections in Gold Atomic Contacts
E. Scheer, W. Belzig, Y. Naveh, M. H. Devoret, D. Esteve, C. Urbina
DOI 10.1103/PhysRevLett.86.284 · Physical Review Letters
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Abstract
We investigate the electronic transport properties of gold point contacts with superconducting aluminum leads. The modifications induced by the proximity effect in the quasiparticle density of states at the contact region are measured by tunnel spectroscopy. The theory of transport through multiple Andreev reflections is extended to incorporate these effects and used to determine the number and transmission coefficients of the conduction channels in the contact regime. We find that the smallest contacts, formed by one gold atom between the electrodes, contribute one single channel to the transport with variable transmission T between 0.1 and 1.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.21 | Pressure not reported | unknown |
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