VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Wednesday 7

› 14:40 - 15:00 (20min)
Coherent Quantum Phase-Slip in Josephson junction chains
Gianluca Rastelli  1@  
1 : University of Konstanz  -  Website
78457 Konstanz, Germany Phone: +49 (0)7531 / 88 - 0 Fax: +49 (0)7531 / 88 - 3688 -  Germany

Coherent Quantum Phase-Slip (CQPS) processes in superconducting systems are an active research topic. They have been studied theoretically and experimentally, in 1D Josephson junction chains and in superconducting nanowires.

In the first part of the talk, I will discuss CQPSs in Josephson junction rings biased with a magnetic flux and with an arbitrary (long) range for the electrostatic interaction between the N superconducting islands.

In the second part, I will present a comparison between the theory and the experimental observations reported by the group of Grenoble for CQPSs in homogeneous Josephson chains [2] as well as the formation of a coherent charge-state induced by CQPSs in chains containing one weak Josephson element [3].
In the third part, I will present a systematic comparison between Josephson junction chains and superconducting nanowires having, respectively, a weak Josephson element or nanoconstriction where QPSs are pinned [4]. Using this analogy, I will discuss the cross-over between coherent vs incoherent QPSs.

[1] G. Rastelli et al., arXiv:1201.0539;
[2] T. Weissl, G. Rastelli et al. (to be submitted);
[3] G. Rastelli et al. (to be submitted);
[4] G. Rastelli et al. (to be submitted).

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