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arXiv · 1204.4038

Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids

Andrew G. Semenov·Andrei D. Zaikin·Leonid S. Kuzmin
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Abstract

We argue that electron-electron interactions fundamentally restrict the penetration length of Cooper pairs into a diffusive normal metal (N) from a superconductor (S). At low temperatures this Cooper pair dephasing length $L_\varphi$ remains finite and does not diverge at $T \to 0$. We evaluate the subgap conductance of NS hybrids in the presence of electron-electron interactions and demonstrate that this new length $L_\varphi$ can be directly extracted from conductance measurements in such structures.

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Andrew G. Semenov, Andrei D. Zaikin, Leonid S. Kuzmin. 2012-04-18. Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids. https://doi.org/10.1103/physrevb.86.144529

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