Thermal transport in nanoelectronic devices cooled by on-chip magnetic refrigeration

TL;DR

This paper investigates thermal transport in nanoelectronic devices cooled by on-chip magnetic refrigeration, combining experimental and numerical analysis to model thermal dynamics at microkelvin temperatures for quantum tech applications.

Contribution

It introduces a first-principles model for thermal dynamics in nanoelectronic devices cooled by on-chip magnetic refrigeration, enabling simulation of microkelvin temperature behavior.

Findings

Demonstrated the effectiveness of on-chip copper refrigerant in cooling nanoscale devices.

Validated the first-principles model with experimental data.

Outlined a low-investment platform for quantum technologies at microkelvin temperatures.

Abstract

On-chip demagnetization refrigeration has recently emerged as a powerful tool for reaching microkelvin electron temperatures in nanoscale structures. The relative importance of cooling on-chip and off-chip components and the thermal subsystem dynamics are yet to be analyzed. We study a Coulomb blockade thermometer with on-chip copper refrigerant both experimentally and numerically, showing that dynamics in this device are captured by a first-principles model. Our work shows how to simulate thermal dynamics in devices down to microkelvin temperatures, and outlines a recipe for a low-investment platform for quantum technologies and fundamental nanoscience in this novel temperature range.