Andreev bound states in ferromagnet-superconductor nanostructures

Details Andreev bound states in ferromagnet-superconductor nanostructures Andreev bound states in ferromagnet-superconductor nanostructures

2003-02-03

arxiv.org/abs/cond-mat/0302025v1

Physica C 387, 7 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 5 figures included; to be published in Physica C

Scientific paper

10.1016/S0921-4534(03)00633-6

We discuss the properties of a ferromagnet - superconductor heterostructure on the basis of a Hubbard model featuring exchange splitting in the ferromagnet and electron - electron attraction in the superconductor. We have solved the spin - polarized Hartree - Fock - Gorkov equations together with the Maxwell's equation (Ampere's law) fully self-consistently. We have found that a Proximity Effect - Fulde - Ferrell - Larkin - Ovchinnikov state is realized in such a heterostructure. It manifests itself in an oscillatory behavior of the pairing amplitude in the ferromagnet and spontaneously generated spin polarized current in the ground state. We argue that it is built up from the Andreev bound states, whose energy can be tuned by the exchange splitting and hence can coincide with the Fermi energy giving rise to a current carrying $\pi$-state. We also suggest experiments to verify these predictions.

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