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Journal of Low Temperature Physics

, Volume 99, Issue 1–2, pp 81–105 | Cite as

Two-particle tunneling current in Josephson junctions

  • Yu. N. Ovchinnikov
  • R. Cristiano
  • C. Nappi
  • A. Barone
Articles

Abstract

The contribution to the tunneling current of a Josephson junction from the Two-particle tunneling, to the 2nd order approximation in the barrier transparency, is investigated. Expressions for the current onset amplitudes corresponding to eV = Δ1,2 are given together with the full expressions for the voltage and the temperature dependencies of the two-particles current. The theory has ben developed to take also into account corrections due to depairing mechanisms, which lead to the smearing of the current singularities. Introducing a depairing parameter Γ, which accounts for the probability of these processes, I–V curves in the voltage region of the onset of single and two particle current are obtained. It is shown that, though having the same functional dependence, spreading occurs over a voltage range of different widths. In particular, it is shown that the width of the single-particle structure is twice larger the one for the two-particle. A careful investigation of the I–V curves in the region 2 Δ-eV ≪ Δ is presented and some aspects of the interesting voltage region near ¦Δ12¦ is discussed.

Keywords

Magnetic Material Order Approximation Versus Curve Functional Dependence Voltage Range 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • Yu. N. Ovchinnikov
    • 1
  • R. Cristiano
    • 1
  • C. Nappi
    • 1
  • A. Barone
    • 2
  1. 1.Istituto di Cibernetica del C.N.R.NapoliItaly
  2. 2.Dipartimento di Scienze FisicheUniversità “Federico II”NapoliItaly

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