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arXiv · 1410.7932

Decoherence of Cooper pairs and subgap magnetoconductance of superconducting hybrids

Andrew G. Semenov·Andrei D. Zaikin
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Abstract

We demonstrate that electron-electron interactions fundamentally restrict the penetration length of superconducting correlations into a diffusive normal metal (N) attached to a superconductor (S). We evaluate the subgap magnetoconductance $G$ of SN hybrids in the presence of electron-electron interactions and demonstrate that the effect of the magnetic field on $G$ is twofold: It includes ($i$) additional temperature independent dephasing of Cooper pairs and ($ii$) Zeeman splitting between the states with opposite spins. The dephasing length of Cooper pairs can be directly extracted from measurements of the subgap magnetoconductance in SN systems at low temperatures.

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Andrew G. Semenov, Andrei D. Zaikin. 2014-10-29. Decoherence of Cooper pairs and subgap magnetoconductance of superconducting hybrids. https://doi.org/10.1088/0031-8949%2F2015%2Ft165%2F014041

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