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Influence of electron-electron interactions on supercurrent in SNS structures
Репозиторій DSpace/Manakin
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Influence of electron-electron interactions on supercurrent in SNS structures
Тема:
Свеpхпpоводимость, в том числе высокотемпеpатуpная
Інший ID:
PACS: 74.80.Fp, 73.63.Kv, 85.25.Cp, 74.50.+r
Посилання:
Influence of electron-electron interactions on supercurrent in SNS structures / K. Engström, J. Kinaret, R.I. Shekhter, M. Puska H. Saarikoski // Физика низких температур. — 2003. — Т. 29, № 7. — С. 733-739. — Бібліогр.: 33 назв. — англ.
Підтримка:
The authors wish to acknowledge fruitful discussions with Leonid Gorelik, Jason Hogan-O’Neill, Göran Johansson, Axel Ruhe and Vitaly Shumeiko. Financial support was provided by the Swedish Foundation for Strategic Research (SSF) program «Quantum Devices and Nano-Science», by the Swedish Natural Science Research Council, and by the Academy of Finland through its Centre of Excellence Programme (2000–2005).
Дата:
2003
Переглядів:
697
Завантажень:
347
Анотація:
We consider a superconductor-normal quantum dot-superconductor structure in which the number of electrons in the dot can be controlled by a gate voltage. We study the effect of electron-electron interactions on the supercurrent between the two superconductors. Using both an analytic model and numerical density functional calculations, we find that Coulomb interactions may serve to make the system quantum mechanically more "rigid", i.e., increasing its sensitivity to phase gradients, hence enhancing the supercurrent through the structure, especially at small phase differences. Accordingly, we find that in this structure the supercurrent can be controlled by the gate voltage.
