Method for Cooling Nanostructures to Microkelvin Temperatures

TL;DR

This paper introduces a novel method for cooling nanostructures to microkelvin temperatures using individual nuclear refrigerators attached to each measurement lead, achieving millikelvin temperatures on multiple leads simultaneously.

Contribution

It presents a new scheme employing adiabatic nuclear demagnetization with a network of nuclear refrigerators for ultracold nanostructure cooling.

Findings

Achieved ~1 mK temperature on ten measurement leads.

Demonstrated simultaneous cooling of multiple nanostructure leads.

First step toward ultracold nanostructure applications.

Abstract

We propose a new scheme aimed at cooling nanostructures to microkelvin temperatures, based on the well established technique of adiabatic nuclear demagnetization: we attach each device measurement lead to an individual nuclear refrigerator, allowing efficient thermal contact to a microkelvin bath. On a prototype consisting of a parallel network of nuclear refrigerators, temperatures of $\sim 1\,$mK simultaneously on ten measurement leads have been reached upon demagnetization, thus completing the first steps toward ultracold nanostructures.