Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids

Details Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids

2012-04-18

arxiv.org/abs/1204.4038v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

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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