- Conference date: 10-17 August 2005
- Location: Orlando, Florida (USA)
We investigate transport through hybrid structures consisting of two normal metal leads connected via tunnel barriers to one common superconducting electrode. We find clear evidence for the occurrence of non‐local Andreev reflection and elastic cotunneling through the superconductor when the separation of the tunnel barriers is comparable to the superconducting coherence length. The probability of the two processes is energy dependent, with elastic cotunneling dominating at low energy and non‐local Andreev reflection at higher energies. The energy scale of the crossover is found to be the Thouless energy of the superconductor, which indicates the phase coherence of the processes. Our results are relevant for the realization of recently proposed entangler devices.
- Superconducting metals
- Superconductive tunneling
- Andreev reflection
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