Hamiltonian approach to the transport properties of superconducting quantum point contacts

Details Hamiltonian approach to the transport properties of superconducting quantum point contacts Hamiltonian approach to the transport properties of superconducting quantum point contacts

1996-05-03

arxiv.org/abs/cond-mat/9605023v1

Phys. Rev. B 54, 7366 (1996)

Physics

Condensed Matter

Revtex, 31 pages, 6 Postscript figures (ps-files uuencoded); submitted to PRB

Scientific paper

10.1103/PhysRevB.54.7366

A microscopic theory of the transport properties of quantum point contacts giving a unified description of the normal conductor- superconductor (N-S) and superconductor-superconductor (S-S) cases is presented. It is based on a model Hamiltonian describing charge transfer processes in the contact region and makes use of non-equilibrium Green function techniques for the calculation of the relevant quantities. It is explicitly shown that when calculations are performed up to infinite order in the coupling between the electrodes, the theory contains all known results predicted by the more usual scattering approach for N-S and S-S contacts. For the latter we introduce a specific formulation for dealing with the non-stationary transport properties. An efficient algorithm is developed for obtaining the dc and ac current components, which allows a detailed analysis of the different current-voltage characteristics for all range of parameters. We finally address the less understood small bias limit, for which some analytical results can be obtained within the present formalism. It is shown that four different physical regimes can be reached in this limit depending on the values of the inelastic scattering rate and the contact transmission. The behavior of the system in these regimes is discussed together with the conditions for their experimental observability.

Affiliated with

Also associated with

No associations

Rating

Hamiltonian approach to the transport properties of superconducting quantum point contacts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hamiltonian approach to the transport properties of superconducting quantum point contacts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hamiltonian approach to the transport properties of superconducting quantum point contacts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-559609