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Phys. Rev. B 69, 092506 (2004) [4 pages]

Andreev bound states for a superconducting-ferromagnetic box

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J. Koltai1, J. Cserti2,*, and C. J. Lambert3,†
1Department of Biological Physics, Eötvös University, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary
2Department of Physics of Complex Systems, Eötvös University, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary
3Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom

Received 20 June 2003; published 16 March 2004

Within the microscopic Bogoliubov–de Gennes formalism an exact quantization condition for Andreev bound states of the ferromagnetic-superconducting hybrid systems of box geometry is derived and a semiclassical formula for the density of states is obtained. The semiclassical formula is shown to agree with the exact result, even when the exchange field h is much larger than the superconductor order parameter, provided h is small compared with the Fermi energy.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.092506
DOI:
10.1103/PhysRevB.69.092506
PACS:
74.45.+c, 75.45.+j, 03.65.Sq

*Electronic address: cserti@galahad.elte.hu

†Electronic address: c.lambert@lancaster.ac.uk

 
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