Long-range Josephson effect controlled by temperature gradient and circuit topology
I.E. Tamm Department of Theoretical Physics, P.N. Lebedev Physical Institute, 119991, Moscow, Russia
2 Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology (KIT), 76021, Karlsruhe, Germany
Accepted: 5 January 2021
Published online: 21 April 2021
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 -junction states controlled by the temperature gradient as well as by the system geometry. Our predictions can be directly verified in modern experiments.
© The Author(s) 2021
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