Progress in Cooling Nanoelectronic Devices to Ultra-Low Temperatures

Area of Science:

• Condensed Matter Physics
• Quantum Technologies
• Nanoscale Science

Background:

• Achieving sub-millikelvin on-chip electron temperatures is crucial for quantum technologies, sensors, and metrology.
• Historically, on-chip electron temperatures have stagnated around 4 mK for over 15 years, despite bulk material cooling capabilities.

Purpose of the Study:

• To review recent advancements in cooling micro-/nanoelectronic devices to significantly below 10 mK.
• To outline new cooling techniques and their potential for reaching sub-millikelvin electron temperatures.
• To provide a roadmap for future developments in ultralow temperature electronics.

Main Methods:

• Focus on on-chip demagnetisation refrigeration techniques.
• Review progress driven by nanoscale physics, material properties, and heat flow understanding.
• Highlight collaborative efforts between academia and industry.

Main Results:

• Multiple research groups have successfully employed on-chip demagnetisation refrigeration.
• Temperatures around 1 mK have been reached, with the current lowest reported below 0.5 mK.
• Significant progress has been made in the last 5 years.

Conclusions:

• On-chip demagnetisation refrigeration shows strong potential for reaching sub-millikelvin electron temperatures.
• Continued advancements in understanding and techniques are driving progress in ultralow temperature electronics.
• These developments are key to unlocking new physical phenomena and enhancing quantum device performance.