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

• URL: http://arxiv.org/abs/2408.11420v1
• Date: Wed, 21 Aug 2024 08:24:58 GMT
• Title: On-chip quantum confinement refrigeration overcoming electron-phonon heat leaks
• Authors: S. Autti, J. R. Prance, M. Prunnila,
• Abstract summary: We show that a two-dimensional electron gas (2DEG) 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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