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Article

Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids

Physical Review B: Condensed Matter and Materials Physics. 2012. Vol. 86. No. 14. P. 144529-1-144529-5.
Andrew G. Semenov, Zaikin A. D., Kuzmin L. S.

We argue that electron-electron interactions fundamentally restrict the penetration length of Cooper pairs into a diffusive normal metal from a superconductor. At low temperatures, this Cooper pair dephasing length remains finite and does not diverge. We evaluate the subgap conductance of hybrids in the presence of electron-electron interactions and demonstrate that this length Lϕ can be directly extracted from conductance measurements in such structures.