On-chip quantum confinement refrigeration overcoming electron-phonon heat leaks

Abstract

Circuit-based quantum devices rely on keeping electrons at millikelvin temperatures. Improved coherence and sensitivity as well as discovering new physical phenomena motivate pursuing ever lower electron temperatures, accessible using on-chip cooling techniques. Here we show that a two-dimensional electron gas (2DEG), manipulated using gate voltages, works as an on-chip heat sink only limited by a fundamental phonon heat-leak. A single-shot 2DEG cooler can reduce the electron temperature by a factor of two with a hold time up to a second. Integrating an array of such coolers to obtain continuous cooldown in will allow reaching down to microkelvin device temperatures.

7 pages, 3 figures, 1 table

References in corpus (8)

• Ultra-high mobility two-dimensional electron gas in a SiGe/Si/SiGe quantum well
• On-and-off chip cooling of a Coulomb blockade thermometer down to 2.8 mK
• Experimental realization of a Coulomb blockade refrigerator
• Cooling low-dimensional electron systems into the microkelvin regime
• QUEST-DMC superfluid ${}^3$He detector for sub-GeV dark matter
• Electron-Acoustic Phonon Energy Loss Rate in Multi-Component Electron Systems with Symmetric and Asymmetric Coupling Constants
• QUEST-DMC: Background Modelling and Resulting Heat Deposit for a Superfluid Helium-3 Bolometer
• Thermal transport in nanoelectronic devices cooled by on-chip magnetic refrigeration