Phase-coherent heat circulator based on multi-terminal Josephson junctions

TL;DR

This paper proposes a theoretical design for a phase-coherent thermal circulator using multiterminal Josephson junctions, enabling directional heat flow with high efficiency and robustness against disorder.

Contribution

It introduces a novel phase-coherent thermal circulator based on multiterminal Josephson junctions, demonstrating high efficiency and robustness in heat circulation.

Findings

Achieves high heat circulation efficiency over various parameters

Performance remains robust despite disorder

Provides realistic estimates for heat currents

Abstract

We theoretically propose a phase-coherent thermal circulator based on ballistic multiterminal Josephson junctions. The breaking of time-reversal symmetry by either a magnetic flux or a superconducting phase bias allows heat to flow preferentially in one direction from one terminal to the next while heat flow in the opposite direction is suppressed. We find that our device can achieve a high circulation efficiency over a wide range of parameters and that its performance is robust with respect to the presence of disorder. We provide estimates for the expected heat currents for realistic samples.