Coulomb effects in a ballistic one-channel S-S-S device

D. A. Ivanov, M. V. Feigel'man

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We develop a theory of Coulomb oscillations in superconducting devices in the limit of small charging energy EC≪Δ. We consider a small superconducting grain with finite capacitance connected to two superconducting leads by nearly ballistic single-channel quantum point contacts. The temperature is assumed to be very low, so there are no single-particle excitations on the grain. Then the behavior of the system can be described in terms of the quantum mechanics of the superconducting phase on the island. The Josephson energy as a function of this phase has two minima that become degenerate when the phase difference on the leads equals to π, the tunneling amplitude between them being controlled by the gate voltage on the grain. We find the Josephson current and its low-frequency fluctuations, and predict their periodic dependence with period 2e on the induced charge Qx=CVg.

Original languageEnglish
Pages (from-to)349-356
Number of pages8
JournalJournal of Experimental and Theoretical Physics
Volume87
Issue number2
DOIs
Publication statusPublished - 1998
Externally publishedYes

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