Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1
TT 14.7: Vortrag
Montag, 20. März 2017, 17:00–17:15, HSZ 201
Multiple charge transport in a superconducting SET — •Thomas Lorenz, Susanne Sprenger, and Elke Scheer — University of Konstanz, 78467 Konstanz, Germany
A small island connected by two tunnel junctions forms a single electron transistor (SET) that shows Coulomb Blockade (CB) effects. The Orthodox Theory [1,2] quantitatively describes the behaviour in the weak-coupling regime, even in the case of superconducting transport. Despite much effort the transition from the weak- to the strong-coupling regime, in particular in the superconducting state, is not yet fully understood.
We are investigating transport through an all superconducting SET formed by an AlOx tunnel barrier (RT ≈ 120 kΩ) and a mechanically controlled break junction (MCBJ). The MCBJ can be adjusted to cover the whole range from the tunneling (weak coupling) regime to the point-contact (strong coupling) regime. We discuss the interplay between the CB and the appearance of superconducting multiple charge transport (multiple Andreev reflection, Josephson effect).
[1] R. J. Fitzgerald, Phys. Rev. B 57, R11073(R) (1997).
[2] K. K. Likharev, Proc. IEEE 87, 606 (1999).