Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids
Andrew G. Semenov, Andrei D. Zaikin, Leonid S. Kuzmin
DOI 10.1103/PhysRevB.86.144529 · Physical Review B
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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 Lϕ remains finite and does not diverge at T→0. We evaluate the subgap conductance of NS hybrids in the presence of electron-electron interactions and demonstrate that this length Lϕ can be directly extracted from conductance measurements in such structures.
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