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Superconductor-insulator transition in capacitively coupled superconducting nanowires
Alex Latyshev1,2, Andrew G Semenov1,3, Andrei D Zaikin2,4
1I.E. Tamm Department of Theoretical Physics, P.N. Lebedev Physical Institute, 119991 Moscow, Russia.
Beilstein Journal of Nanotechnology
|October 5, 2020
Summary
Proximity can induce insulator transitions in ultrathin superconducting nanowires. Quantum phase slips and mutual capacitance control this superconductor-insulator transition, offering new material possibilities.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Superconductor-insulator transitions are fundamental in low-dimensional systems.
- Quantum phase slips (QPS) are critical mechanisms in these transitions.
Purpose of the Study:
- To investigate superconductor-insulator quantum phase transitions in capacitively coupled superconducting nanowires.
- To understand the influence of inter-wire interactions and quantum phase slips.
Main Methods:
- Derivation of coupled Berezinskii-Kosterlitz-Thouless-like renormalization group equations.
- Analysis of the interplay between quantum phase slips and plasma modes in coupled nanowires.
Main Results:
- Interactions between quantum phase slips are modified by plasma modes in adjacent wires.
- The superconductor-insulator transition is influenced by neighboring wire parameters and mutual capacitance.
- Superconducting nanowires can become insulating when placed in close proximity.
Conclusions:
- Capacitive coupling significantly alters the quantum phase transition dynamics in superconducting nanowires.
- The proximity effect offers a tunable pathway to induce insulator states in superconducting systems.
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