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Journal of Superconductivity and Novel Magnetism

Voltage Fluctuations in a System of Capacitively Coupled Superconducting Nanowires

A. Latysev, Andrew G. Semenov, Andrei D. Zaikin

Published Jan 14, 2020• 4 citations
Publisher
DOI
10.1007/s10948-019-05402-3

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•Sep 16, 2011•1 citation
We propose a transistorlike circuit including two serially connected segments of a narrow superconducting nanowire joint by a wider segment with a capacitively coupled gate in between. This circuit is made of amorphous NbSi film and embedded in a network of on-chip Cr microresistors ensuring a sufficiently high external electromagnetic impedance. Assuming a virtual regime of quantum phase slips (QPS) in two narrow segments of the wire, leading to quantum interference of voltages on these segments, this circuit is dual to the dc SQUID. Our samples demonstrated appreciable Coulomb blockade voltage (analog of critical current of the SQUIDs) and periodic modulation of this blockade by an electrostatic gate (analog of flux modulation in the SQUIDs). The model of this QPS transistor is discussed.
We propose a transistor-like circuit including two serially connected segments of narrow superconducting nanowire joint by a wider segment with capacitively coupled gate in between. This circuit is made of amorphous NbSi film and embedded in a network of on-chip Cr microresistors ensuring sufficiently high external electromagnetic impedance. Assuming virtual regime of quantum phase slips (QPS) in two narrow segments of the wire, leading to correlated single Cooper pair tunneling, this circuit is dual to the dc SQUID. Our samples demonstrated appreciable Coulomb blockade voltage (analog of critical current of the SQUIDs) and periodic modulation of this blockade by electrostatic gate (analog of flux modulation in the SQUIDs). The model of this QPS transistor is discussed.