Crossed Andreev reflection in diffusive contacts: Quasiclassical Keldysh-Usadel formalism


Brinkman, A. and Golubov, A.A. (2006) Crossed Andreev reflection in diffusive contacts: Quasiclassical Keldysh-Usadel formalism. Physical Review B: Condensed matter and materials physics, 74 (21). p. 214512. ISSN 1098-0121

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Abstract:Crossed Andreev reflection in multiterminal structures in the diffusive regime is addressed within the quasiclassical Keldysh-Usadel formalism. The elastic cotunneling and crossed Andreev reflection of quasiparticles give nonlocal currents and voltages (depending on the actual biasing of the devices) by virtue of the induced proximity effect in the normal-metal electrodes. The magnitude of the nonlocal processes is found to scale with the square of the barrier transparency and to decay exponentially with interface spacing. Nonlocal cotunneling and crossed Andreev conductances are found to contribute equally to the nonlocal current, which is of relevance to the use of normal-metal–superconducting heterostructures as sources of entanglement
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Copyright:© 2006 The American Physical Society
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