Crossed Andreev reflection in a d-wave superconductor with two quantum point contacts

Details Crossed Andreev reflection in a d-wave superconductor with two quantum point contacts Crossed Andreev reflection in a d-wave superconductor with two quantum point contacts

2004-01-08

arxiv.org/abs/cond-mat/0401111v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

We theoretically study the crossed Andreev reflection in a hybrid nanostructure which comprises a d-wave superconductor and two normal-metal quantum wires. When the superconductor of the (110) oriented surface is in contact with the wires parallel and placed close to each other, the Andreev bound state is formed by the crossed Andreev reflection. When the contact barrier potential is sufficiently large, two sharp peaks appear in the conductance well below the gap structure, which originate from the bonding and antibonding Andreev bound states. We propose that these Andreev bound states form a two-level quantum system (qubit).

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