Electron subband degeneracy heat pump for cryogenic cooling

• URL: http://arxiv.org/abs/2207.14237v1
• Date: Thu, 28 Jul 2022 17:17:10 GMT
• Title: Electron subband degeneracy heat pump for cryogenic cooling
• Authors: Chulin Wang, Thomas Douglas, Lucia Steinke, Matthew A Grayson
• Abstract summary: An unconventional method of solid-state cryogenic cooling utilizing the electron subband degeneracy of semiconductor heterostructures is discussed in this Letter. The working principle of using the electrons as the working medium to perform cyclic heat pumping under electrostatic subband "expansion" and "compression" is discussed.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: An unconventional method of solid-state cryogenic cooling utilizing the electron subband degeneracy of semiconductor heterostructures is discussed in this Letter. The working principle of using the electrons as the working medium to perform cyclic heat pumping under electrostatic subband "expansion" and "compression" is discussed. The calculated base temperature can reach below dilution refrigeration temperatures with the fundamental limit set by electron-phonon interaction. Using an ultra-wide GaAs quantum well as an example, the cooling power per unit volume is estimated to reach $0.85\ \rm \mu W/cm^3$ at $25\ \rm mK$ with a hot-side temperature of $42.5\ \rm mK$, suitable for applications such as quantum computing.

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