Nonlocal Andreev reflection at high transmissions
Mikhail S. Kalenkov, Andrei D. Zaikin
DOI 10.1103/PhysRevB.75.172503 · Physical Review B
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Abstract
We analyze nonlocal effects in electron transport across three-terminal normal-superconducting-normal (NSN) structures. Subgap electrons entering the S electrode from one N metal may form Cooper pairs with their counterparts penetrating from another N metal. This phenomenon of crossed Andreev reflection—combined with normal scattering at SN interfaces—yields two different contributions to nonlocal conductance which we evaluate nonperturbatively at arbitrary interface transmissions. Both these contributions reach their maximum values at fully transmitting interfaces and demonstrate interesting features which can be tested in future experiments.
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