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Current-Phase Relationship, Thermal and Quantum Phase Slips in Superconducting Nanowires Made on a Scaffold Created Using Adhesive Tape
journal contribution
posted on 2009-05-13, 00:00 authored by Myung-Ho Bae, Robert C. Dinsmore, Thomas Aref, Matthew Brenner, Alexey BezryadinQuantum phase slippage (QPS) in a superconducting nanowire is a new candidate for developing a quantum bit [Mooij et al. New J. Phys. 2005, 7, 219; Mooij et al. Nat. Phys. 2006, 2, 169; Khlebnikov http://arxiv.org/abs/quant-ph/0210019 2007]. It has also been theoretically predicted that the occurrence of QPS significantly changes the current-phase relationship (CPR) of the wire due to the tunneling between topologically different metastable states [Khlebnikov Phys. Rev. B 2008, 78, 014512]. We present studies on the microwave response of the superconducting nanowires to reveal their CPRs. First, we demonstrate a simple nanowire fabrication technique, based on commercially available adhesive tapes, which allows making thin superconducting wire from different metals. We compare the resistance vs temperature curves of Mo76Ge24 and Al nanowires to the classical and quantum models of phase slips. In order to describe the experimentally observed microwave responses of these nanowires, we use the McCumber−Stewart model [McCumber J. Appl. Phys. 1968, 39, 3113; Stewart Appl. Phys. Lett. 1968, 12, 277], which is generalized to include either classical or quantum CPR.
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microwave responsessuperconducting nanowiresQPSsuperconducting wirequantum CPRnanowire fabrication techniqueresistance vs temperature curvesNew JApplphase slipsmicrowave responsequantum bitmetastable statesAdhesive TapeQuantum phase slippageSuperconducting NanowiresAl nanowiresKhlebnikov PhysQuantum Phase Slipsquantum modelsMcCumber Jalsuperconducting nanowireMo 76GeMooij
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