Thermal noise in superconducting quantum point contacts

被引：72

作者：

MartinRodero, A ^{[1
]}

Yeyati, AL ^{[1
]}

GarciaVidal, FJ ^{[1
]}

机构：

[1] UNIV LONDON IMPERIAL COLL SCI & TECHNOL, BLACKETT LAB, CONDENSED MATTER THEORY GRP, LONDON SW7 2BZ, ENGLAND

来源：

PHYSICAL REVIEW B | 1996年 / 53卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.53.R8891

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a theory for the frequency-dependent current fluctuations in superconducting quantum point contacts (SQPC) within the dc transport regime. This theory is valid for any barrier transparency between the tunnel and ballistic limits, yielding an analytical expression for the fluctuations spectrum in the subgap region. It is shown that the level of noise in a quasiballistic SQPC may have a huge increase in comparison with the case of a normal contact carrying the same average current. The effect of this high level of noise on the actual observability of the current-phase relation for a ballistic point contact is discussed in connection with recent experimental measurements.

引用

页码：R8891 / R8894

页数：4

共 25 条

[11]

KELDYSH LV, 1965, SOV PHYS JETP-USSR, V20, P1018

[12]

Khlus V. A., 1987, Soviet Physics - JETP, V66, P1243

[13] The current-phase relation of a mechanically controllable breakjunction [J].

Koops, MC ;

Feenstra, L ;

Vleeming, BJ ;

Omelyanchouk, AN ;

Ouboter, RD .

PHYSICA B, 1996, 218 (1-4) :145-147

[14]

Kulik I. O., 1977, SOV J LOW TEMP PHYS, V3, P459

[15]

LESOVIK GB, 1989, JETP LETT+, V49, P592

[16] MICROSCOPIC THEORY OF JOSEPHSON MESOSCOPIC CONSTRICTIONS [J].

MARTINRODERO, A ;

GARCIAVIDAL, FJ ;

YEYATI, AL .

PHYSICAL REVIEW LETTERS, 1994, 72 (04) :554-557

[17] Microscopic theory of the phase-dependent linear conductance in highly transmissive superconducting quantum point contacts [J].

MartinRodero, A ;

Yeyati, AL ;

Cuevas, JC .

PHYSICA B, 1996, 218 (1-4) :126-129

[18] QUASI-PARTICLES AND GAUGE INVARIANCE IN THE THEORY OF SUPERCONDUCTIVITY [J].

NAMBU, Y .

PHYSICAL REVIEW, 1960, 117 (03) :648-663

[19] On the influence of thermal fluctuations on the current-phase relation in superconducting point contacts [J].

Ouboter, RD ;

Omelyanchouk, AN .

PHYSICA B, 1995, 216 (1-2) :37-42

[20] FLUCTUATION PHENOMENA IN TUNNEL-JUNCTIONS [J].

ROGOVIN, D ;

SCALAPINO, DJ .

ANNALS OF PHYSICS, 1974, 86 (01) :1-90

← 1 2 3 →