Wigner-function approach to a single-electron tunnel junction

Sangchul Oh, Sang Il Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We demonstrate that the Wigner function is suitable to describe single-electron tunneling in ultrasmall tunnel junctions. For a current-biased junction, we derive a master equation for the Wigner function which describes charging effects on Cooper-pair tunneling, quasiparticle-pair tunneling, and normal single-electron tunneling in an unified way. We obtain the current-voltage I-V characteristic for an ultrasmall Josephson junction that recovers those for the Josephson junction with no charging energy in the limit of e/C→0. It is predicted that, due to charging effect in the ultrasmall Josephson, the position of the Riedel peak and the gap of the quasiparticle-pair interference term are changed from 2Δ/e to 2Δ/e-e/2C, while the quasiparticle current's onset changes from 2Δ/e to 2Δ/e + e/2C.

Original languageEnglish
Pages (from-to)4440-4443
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number7
Publication statusPublished - 15 Aug 1996
Externally publishedYes

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Electron tunneling
Tunnel junctions
tunnel junctions
charging
electron tunneling
Josephson junctions
Electrons
electrons
Electric potential
interference
electric potential
energy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Wigner-function approach to a single-electron tunnel junction. / Oh, Sangchul; Choi, Sang Il.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 54, No. 7, 15.08.1996, p. 4440-4443.

Research output: Contribution to journalArticle

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