Landau Cooling in Metal-Semiconductor Nanostructures

TL;DR

This paper proposes a Landau quantization-based electron cooling method for nanoscale conductors, utilizing magnetic-field tunability to achieve significant cooling power with robustness against imperfections.

Contribution

It introduces a novel quantum refrigerator concept based on Landau levels, with detailed discussion on implementation and performance advantages.

Findings

Cooling power ~1 nW at a few K

Performance robust against disorder and imperfections

Tunability via magnetic-field intensity

Abstract

An electron-cooling principle based on Landau quantization is proposed for nanoscale conductor systems. Operation relies on energy-selective electron tunneling into a two-dimensional electron gas in quantizing magnetic fields. This quantum refrigerator provides significant cooling power (~1 nW at a few K for realistic parameters) and offers a unique flexibility thanks to its tunability via the magnetic-field intensity. The available performance is only marginally affected by nonidealities such as disorder or imperfections in the semiconductor. Methods for the implementation of this system and its characterization are discussed.