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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.52: Poster
Monday, March 14, 2011, 14:00–18:00, P4
Application of NbSi nanowires for quantum phase slip experiment — •Terhi T. Hongisto and Alexander B. Zorin — Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig
A superconducting nanowire of sufficiently small (nanometer scale) cross section is expected to lose phase coherence due to the quantum phase slips (QPS) at low temperatures. The QPS nanowire combined with high impedance environment forms a system dual to the Josephson junction and is suggested to be applicable for a quantum current standard [1]. In analogy to the current-biased Josephson junction this QPS nanowire, biased by voltage below the critical value VC, can be characterized by a washboard potential for the charge variable. Application of ac drive should result in the steps of current, I=2ef, which are dual to Shapiro steps.
Using approach similar to ones described in [2, 3] we have developed technology of fabrication of NbSi nanowires with cross sections down to 15 nm by 8 nm integrated with high-ohmic Cr film resistors. The circuits have been characterized at mK temperatures and some of them exhibited characteristic Coulomb blockade behaviour.
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J. Romijn, PhD Thesis, Delft University, (1991).
T. van der Sar, Master Thesis, Delft University, (2007).