Cooling electrons by magnetic-field tuning of Andreev reflection

TL;DR

This paper proposes a novel solid-state cooling method using magnetic-field-tuned suppression of Andreev reflection in superconductor/2D electron gas nanostructures, achieving heat fluxes much higher than existing technologies for cryogenic quantum devices.

Contribution

It introduces a new cooling mechanism based on magnetic control of Andreev reflection, enabling significantly enhanced heat fluxes in quantum nanostructures.

Findings

Heat fluxes up to 10^4 times greater than current superconducting tunnel junctions.

Effective cooling mechanism operable at cryogenic temperatures.

Potential for integration into quantum nanostructures.

Abstract

A solid-state cooling principle based on magnetic-field-driven tunable suppression of Andreev reflection in superconductor/two-dimensional electron gas nanostructures is proposed. This cooling mechanism can lead to very large heat fluxes per channel up to 10^4 times greater than currently achieved with superconducting tunnel junctions. This efficacy and its availability in a two-dimensional electron system make this method of particular relevance for the implementation of quantum nanostructures operating at cryogenic temperatures.