Electron refrigeration in hybrid structures with spin-split superconductors

Abstract

Electron tunneling between superconductors and normal metals has been used for an efficient refrigeration of electrons in the latter. Such cooling is a non-linear effect and usually requires a large voltage. Here we study the electron cooling in heterostructures based on superconductors with a spin-splitting field coupled to normal metals via spin-filtering barriers. The cooling power shows a linear term in the applied voltage. This improves the coefficient of performance of electron refrigeration in the normal metal by shifting its optimum cooling to lower voltage, and also allows for cooling the spin-split superconductor by reverting the sign of the voltage. We also show how tunnel coupling spin-split superconductors with regular ones allows for a highly efficient refrigeration of the latter.

References in corpus (7)

• The Josephson heat interferometer
• Micrometre-scale refrigerators
• Recombination limited energy relaxation in a BCS superconductor
• Revealing the magnetic proximity effect in EuS/Al bilayers through superconducting tunneling spectroscopy
• Spin-Resolved Tunneling Studies of the Exchange Field in EuS/Al Bilayers
• Electron and phonon Cooling in a Superconductor - Normal Metal - Superconductor Tunnel Junction
• A robust platform cooled by superconducting electronic refrigerators

Cited by in corpus (12)

• Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures
• Charge transport through spin-polarized tunnel junction between two spin-split superconductors
• Nonlocal thermoelectric effects in high-field superconductor-ferromagnet hybrid structures
• On-Chip Cooling by Heating with Superconducting Tunnel Junctions
• Current rectification in junctions with spin-split superconductors
• Superconductor-quantum dot hybrid coolers
• Complete magnetic control over the superconducting thermoelectric effect
• Quasiparticle cooling using a Topological insulator-Superconductor hybrid junction
• High-performance Andreev interferometer-based electronic coolers
• Phase-controlled heat modulation with Aharonov-Bohm interferometers
• Spectral properties of Andreev crystals
• Thermalization of hot electrons via interfacial electron-magnon interaction