Long-range Josephson effect controlled by temperature gradient and circuit topology

We demonstrate that the supercurrent can be strongly enhanced in cross-like superconducting hybrid nanostructures ( X -junctions) exposed to a temperature gradient. At temperatures T exceeding the Thouless energy of our X -junction, the Josephson current decays algebraically with increasing T and ca...

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Bibliographic Details
Published in:The European physical journal. ST, Special topics Special topics, 2021-06, Vol.230 (4), p.813-820
Main Authors: Kalenkov, Mikhail S., Zaikin, Andrei D.
Format: Article
Language:English
Subjects:
Atomic
Circuits
Classical and Continuum Physics
Condensed Matter Physics
Josephson effect
Materials Science
Measurement Science and Instrumentation
Molecular
Non-Equilibrium Systems and Foundations of Quantum Physics
Optical and Plasma Physics
Physics
Physics and Astronomy
Regular Article
Topology
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Summary:We demonstrate that the supercurrent can be strongly enhanced in cross-like superconducting hybrid nanostructures ( X -junctions) exposed to a temperature gradient. At temperatures T exceeding the Thouless energy of our X -junction, the Josephson current decays algebraically with increasing T and can be further enhanced by a proper choice of the circuit topology. At large values of the temperature gradient, the non-equilibrium contribution to the supercurrent may become as large as the equilibrium one at low T . We also predict a variety of transitions between 0- and π -junction states controlled by the temperature gradient as well as by the system geometry. Our predictions can be directly verified in modern experiments.
ISSN:1951-6355
1951-6401
DOI:10.1140/epjs/s11734-021-00065-5