Cooper pair wavefunction approach to the Josephson effect

被引：0

作者：

Kim, Yong-Jihn ^{[1
,2
]}

机构：

[1] University of Puerto Rico, Bilkent University, Department of Physics, Mayaguez, 00681, Puerto Rico

[2] Department of Physics, 06533 Bilkent, Ankara, Turkey

来源：

Journal of Applied Physics | 2008年 / 103卷 / 10期

关键词：

We introduce an approach to the Josephson effect in the superconductor-insulator-superconductor (SIS) tunnel junctions. The Josephson coupling energy is calculated from the overlap of real space Cooper pair wavefunctions in two superconductors through an insulating barrier. It is shown that the Josephson tunneling is limited by the size of the Cooper pair and its shrinking during the tunneling. Therefore; the Josephson coupling energy and the critical current become extremely small in high Tc superconductors; including MgB2. This shrinking also causes the observed direct current (dc) supercurrent in low Tc superconductors; such as Nb; Pb; and Sn; to fall off much faster than 1 Rn for tunneling resistance Rn above a few ohms. Consequently; there is a material-dependent threshold resistance; above which the supercurrent decreases much faster with increasing resistance. Spectacular confirmation is provided by the Mg B2 break and tunnel junctions; where only small gap shows the supercurrents; while the big gap does not. The impurity-induced shrinking is also shown to limit the critical current. Furthermore; the (weak) temperature dependence of the Cooper pair size is found to contribute to the temperature dependence of the dc supercurrent. This understanding may lead to the discovery of better materials for SIS junctions other than Nb and the optimum miniaturization of the SIS junctions for the petaflops superconducting supercomputers. © 2008 American Institute of Physics;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Journal article (JA)

引用

共 50 条

[31] Stabilized parametric cooper-pair pumping in a linear array of coupled Josephson junctions
Cholascinski, Mateusz
Chhajlany, Ravindra W.
PHYSICAL REVIEW LETTERS, 2007, 98 (12)
[32] Microwave Photon-Assisted Incoherent Cooper-Pair Tunneling in a Josephson STM
Roychowdhury, A.
Dreyer, M.
Anderson, J. R.
Lobb, C. J.
Wellstood, F. C.
PHYSICAL REVIEW APPLIED, 2015, 4 (03):
[33] Controlled single-Cooper-pair charging effects in a small Josephson junction array
van der Wal, CH
Mooij, JE
JOURNAL OF SUPERCONDUCTIVITY, 1999, 12 (06): : 807 - 812
[34] Cooper pair transport and macroscopic quantum dynamics in Josephson junctions through ferromagnetic insulators
Kawabata, Shiro
Asano, Yasuhiro
Tanaka, Yukio
Kashiwaya, Satoshi
Golubov, Alexander A.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2008, 468 (7-10): : 701 - 704
[35] Simulation of supersymmetric quantum mechanics in a Cooper-pair box shunted by a Josephson rhombus
Ulrich, Jascha
Otten, Daniel
Hassler, Fabian
PHYSICAL REVIEW B, 2015, 92 (24)
[36] Nernst effect studies of Cooper pair fluctuations
Aubin, Herve
Behnia, Kamran
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2018, 552 : 38 - 41
[37] Controlled Single-Cooper-Pair Charging Effects in a Small Josephson Junction Array
Caspar H. van der Wal
J. E. Mooij
Journal of Superconductivity, 1999, 12 : 807 - 812
[38] Quantum state of Josephson junction as Cooper pair number-phase entangled state in the bosonic operator Josephson model
Fan, Hong-Yi
Wang, Ji-Suo
Meng, Xiang-Guo
INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2007, 21 (21): : 3697 - 3706
[39] Coulomb blockade and incoherent Cooper pair tunneling in ultrasmall Josephson double junctions with external circuits
Iwabuchi, S
PHYSICA B-CONDENSED MATTER, 1996, 227 (1-4) : 245 - 248
[40] Interplay of single particle and Josephson Cooper pair tunnelings on the electronic spectra of bilayer cuprate superconductors
Ahalawat, P.
Pathak, P. K.
Ajay
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2007, 455 (1-2): : 46 - 51

← 1 2 3 4 5 →