Electron Refrigeration in the Tunneling Approach
Heinz-Olaf Muller, K. A. Chao (Norwegian University of Science and, Technology)
TL;DR
This paper provides a theoretical analysis of electron refrigeration via superconducting-normal metal tunnel junctions, identifying optimal operating conditions and comparing results with recent experimental data.
Contribution
It introduces an approximation method for the heat current expression, enabling detailed analysis of device performance and optimal parameters.
Findings
Optimal bias voltage for maximum cooling identified
Maximum heat current and temperature reduction quantified
Results align with recent experimental observations
Abstract
The qualities of electron refrigeration by means of tunnel junctions between superconducting and normal--metal electrodes are studied theoretically. A suitable approximation of the basic expression for the heat current across those tunnel junctions allows the investigation of several features of the device such as its optimal bias voltage, its maximal heat current, its optimal working point, and the maximally gained temperature reduction. Fortunately, the obtained results can be compared with those of a recent experiment.
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