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

Abstract

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 $\pi$-junction states controlled by the temperature gradient as well as by the system geometry. Our predictions can be directly verified in modern experiments.

10 pages, 5 figures

References in corpus (4)

• Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface
• Thermopower induced by a supercurrent in superconductor-normal-metal structures
• Phase-sensitive thermoelectricity and long-range Josephson effect supported by thermal gradient
• Phase-coherent thermoelectricity and non-equilibrium Josephson current in Andreev interferometers

Cited by in corpus (2)

• Fractional Shapiro steps without fractional Josephson effect
• Phase-coherent thermoelectricity in superconducting hybrids (Brief Review)