Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 12: Poster Session Superconductivity
TT 12.14: Poster
Montag, 11. März 2013, 15:00–19:00, Poster D
Manifestly Non-Gaussian Fluctuations in Superconductor-Normal Metal Tunnel Nanostructures — •Matti Laakso1,2, Tero Heikkilä2, and Yuli Nazarov3 — 1Institut für Theorie der Statistischen Physik, RWTH Aachen University, Aachen, Germany — 2Low Temperature Laboratory, Aalto University, Espoo, Finland — 3Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
Recently, temperature fluctuation statistics has been studied in non-interacting islands [1] and overheated single-electron transistors [2].
We propose [3] a mesoscopic setup which exhibits strong and manifestly non-Gaussian fluctuations of energy and temperature when suitably driven out of equilibrium. The setup consists of a normal metal island (N) coupled by tunnel junctions (I) to two superconducting leads (S), forming a SINIS structure, and is biased near the threshold voltage for quasiparticle tunneling, eV≈2Δ. The fluctuations can be measured by monitoring the time-dependent electric current through the system, which makes the setup suitable for the realization of feedback schemes which allow to stabilize the temperature to the desired value.
[1] T.T. Heikkilä and Y.V. Nazarov, Phys. Rev. Lett. 102, 130605 (2009)
M.A. Laakso, T.T. Heikkilä, Y.V. Nazarov, Phys. Rev. Lett. 104, 196805 (2010)
M.A. Laakso, T.T. Heikkilä, Y.V. Nazarov, Phys. Rev. Lett. 108, 067002 (2012)