Phase-dependent heat current of granular Josephson junction for different geometries

TL;DR

This paper theoretically explores how the geometry and magnetic flux influence the phase-dependent heat transport in granular Josephson junctions, revealing geometry-specific diffraction patterns and the impact of trapped fluxons.

Contribution

It introduces a theoretical analysis of heat current behavior in granular Josephson junctions with various geometries under magnetic fields, highlighting the effects of granularity and flux trapping.

Findings

Heat current diffraction patterns depend on junction geometry.

Increasing trapped fluxons alters the current pattern to resemble d-wave superconductors.

Granular superconductors offer controllable heat transport properties for applications.

Abstract

We theoretically investigate the phase-dependent heat transport of a temperature-biased granular Josephson junction in the presence of a perpendicular magnetic field. We illustrate the influence of geometry of the junction on the thermal current. The use of granular Josephson junction rather than bulk one makes significant changes in the heat current behavior. The heat current diffraction pattern of the rectangular, circular and annular geometries with no trapped fluxons demonstrates similar to the current of s-wave superconducting junction. By increasing the number of trapped fluxon, the pattern of current behaves such as d-wave superconducting junction. The feasibility of using granular superconductors, with different geometries, controlled by the magnetic field provides an appropriate tool to obtain the desired result for a specific application.