Proximity Effect and Multiple Andreev Reflections in Gold Atomic Contacts

Autor:	Y. Naveh, Michel Devoret, Wolfgang Belzig, Cristian Urbina, Elke Scheer, Daniel Esteve
Rok vydání:	2001
Předmět:	Superconductivity Materials science Condensed matter physics General Physics and Astronomy Thermal conduction Andreev reflection Condensed Matter::Superconductivity Atom Quasiparticle Proximity effect (superconductivity) Density of states ddc:530 Spectroscopy
Zdroj:	Physical Review Letters, 86 (2)
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.86.284
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1cd2f8ca4140d6afe727a1a40551068b https://doi.org/10.1103/physrevlett.86.284 Zobrazit plný text záznamu