Proximity nanovalve with large phase-tunable thermal conductance

Abstract

We propose a phase-controlled heat-flux quantum valve based on the proximity effect driven by a superconducting quantum interference proximity transistor (SQUIPT). Its operation relies on the phase-dependent quasiparticle density of states in the Josephson weak-link of the SQUIPT which controls thermal transport across the device. In a realistic Al/Cu-based setup the structure can provide efficient control of thermal current inducing temperature swings exceeding $\sim 100$~mK, and flux-to-temperature transfer coefficients up to $\sim 500$~mK/${\Phi }_0$ below 100~mK. The nanovalve performances improve by lowering the bath temperature, making the proposed structure a promising building-block for the implementation of coherent caloritronic devices operating below 1~K.

References in corpus (7)

• Single-mode heat conduction by photons
• The Josephson heat interferometer
• Phase controlled superconducting proximity effect probed by tunneling spectroscopy
• Density of states and supercurrent in diffusive SNS junctions: role of nonideal interfaces and spin-flip scattering
• Phase-controlled superconducting heat-flux quantum modulator
• Highly-sensitive superconducting quantum interference proximity transistor
• Quantum interference hybrid spin-current injector

Cited by in corpus (9)

• High efficiency thermal switch based on topological Josephson junctions
• Spectral characteristics of a fully-superconducting SQUIPT
• Phase-coherent heat circulators with normal- or superconducting contacts
• Quasiparticle entropy in superconductor/normal metal/superconductor proximity junctions in the diffusive limit
• Four-terminal graphene-superconductor thermal switch controlled by the superconducting phase difference
• Thermoelectric processes of quantum normal-superconductor interfaces
• Thermodynamics of a phase-driven proximity Josephson junction
• Out-of-equilibrium nonlinear model of thermoelectricity in superconducting tunnel junctions
• Photonic heat transport from weak to strong coupling