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Titolo:
DIFFUSIVE AND BALLISTIC MOTION IN SUPERCONDUCTING HYBRID STRUCTURES
Autore:
CLAUGHTON NR; RAIMONDI R; LAMBERT CJ;
Indirizzi:
UNIV LANCASTER,SCH PHYS & CHEM LANCASTER LA1 4YB ENGLAND
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 14, volume: 53, anno: 1996,
pagine: 9310 - 9320
SICI:
0163-1829(1996)53:14<9310:DABMIS>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUASI-PARTICLE; ANDREEV REFLECTION; CONDUCTANCE; SCATTERING; TRANSPORT; MICROJUNCTIONS; INTERFEROMETER; FLUCTUATIONS; CONTACTS; BARRIERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
N.R. Claughton et al., "DIFFUSIVE AND BALLISTIC MOTION IN SUPERCONDUCTING HYBRID STRUCTURES", Physical review. B, Condensed matter, 53(14), 1996, pp. 9310-9320

Abstract

We examine transport properties of superconducting hybrid mesoscopic structures, in both the diffusive and ballistic regimes. For diffusivestructures, analytic results from quasiclassical theory are compared with predictions from numerical, multiple-scattering calculations performed on small structures. For many structures, the two methods yield comparable results and in some cases, quantitative agreement is obtained. These results not only demonstrate that quasiclassical theory can yield the ensemble averaged conductance [G] of small structures of dimensions of order 10-20 Fermi wavelengths, but also establish that numerical-scattering calculations on such small structures can yield results for [G] which are characteristic of much larger systems. One exception arises for Andreev interferometers, where quasiclassical theory predicts a vanishing conductance at a phase difference phi=pi, whereas our numerical approach yields a finite value. We suggest that this is aconsequence of the one-dimensional nature of the currently available quasiclassical descriptions. Having compared the two approaches, we extend the multiple-scattering analysis to the ballistic limit, where the sample dimensions become smaller than the elastic mean free path. Inthis limit, the numerical results can be understood in terms of a two-channel model, which emphasizes the role of interchannel scattering.

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Documento generato il 24/10/20 alle ore 11:46:47