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arXiv · cond-mat/0501477

Thermal conductance of Andreev interferometers

Z. Jiang·V. Chandrasekhar
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Abstract

We calculate the thermal conductance $G^T$ of diffusive Andreev interferometers, which are hybrid loops with one superconducting arm and one normal-metal arm. The presence of the superconductor suppresses $G^T$; however, unlike a conventional superconductor, $G^T/G^T_N$ does not vanish as the temperature $T\to0$, but saturates at a finite value that depends on the resistance of the normal-superconducting interfaces, and their distance from the path of the temperature gradient. The reduction of $G^T$ is determined primarily by the suppression of the density of states in the proximity-coupled normal metal along the path of the temperature gradient. $G^T$ is also a strongly nonlinear function of the thermal current, as found in recent experiments.

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Z. Jiang, V. Chandrasekhar. 2005-04-18. Thermal conductance of Andreev interferometers. https://doi.org/10.1103/physrevlett.94.147002

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