VietNam 2013 

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

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Tuesday 6
Hybrid's

› 9:00 - 9:30 (30min)
Equilibrium and Nonequilibrium Superconducting Proximity Effect in Quantum-Dot Systems
Jürgen König  1@  
1 : University of Duisburg-Essen  (UDE)
University of Duisburg-Essen 47048 Duisburg -  Germany

We theoretically analyze electronic transport through interacting quantum dots tunnel coupled to normal and superconducting leads. The proximity of superconducting leads induces superconducting correlations in the quantum dot which mediate Josephson and Andreev currents through the dot. We employ a real-time diagrammatic approach that treats charging energy, superconductivity, and nonequilibrium on equal footing [1]. Based on this formalism, we address non-local Andreev effects in single- and double-dot geometries [2], show how the superconducting proximity effect can be revealed by measuring the shot noise [3], propose a scheme to generate superconducting correlations on the dot via a time-dependent tunnel coupling [4], and discuss the possibility to induce unconventional (e.g. odd-triplet) pairing amplitudes.

[1] M. Pala, M. Governale, and J. König, New J. Phys. 9, 278 (2007); M. Governale, M. Pala, and J. König, Phys. Rev. B 77, 134513 (2008).
[2] D. Futterer, M. Governale, M. Pala, and J. König, Phys. Rev. B 79, 054505 (2009); J. Eldridge, M. Pala, M. Governale, and J. König, Phys. Rev. B 82, 184507 (2010).
[3] A. Braggio, M. Governale, M. Pala, and J. König, Solid State Commun. 151, 155 (2011).
[4] A.G. Moghaddam, M. Governale, and J. König, Phys. Rev. B 85, 094518 (2012).


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