Spin Polarized Current in the Ground State of Superconductor - Ferromagnet - Insulator Trilayers

Details Spin Polarized Current in the Ground State of Superconductor - Ferromagnet - Insulator Trilayers Spin Polarized Current in the Ground State of Superconductor - Ferromagnet - Insulator Trilayers

2002-07-04

arxiv.org/abs/cond-mat/0207135v1

Eur. Phys. J B32, 163 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 14 figures

Scientific paper

10.1140/epjb/e2003-00085-7

We study the ground state properties of a superconductor - ferromagnet - insulator trilayer on the basis of a Hubbard Model featuring exchange splitting in the ferromagnet and electron - electron attraction in the superconductor. We solve the spin - polarized Hartree - Fock - Gorkov equations together with the Maxwell's equation (Ampere's law) fully self-consistently. For certain values of the exchange splitting we find that a spontaneous spin polarized current is generated in the ground state and is intimately related to Andreev bound states at the Fermi level. Moreover, the polarization of the current strongly depends on the band filling.

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