Volume 70, Number 6, June 2005
|Page(s)||796 - 802|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||13 May 2005|
Angular conductance resonances of quantum dots non-collinearly coupled to ferromagnetic leads
Department of Materials Science and Engineering, Royal Institute of Technology (KTH) SE-100 44 Stockholm, Sweden and Physics Department, Uppsala University - Box 530, SE-751 21 Uppsala, Sweden and NORDITA - Blegdamsvej 17, DK-2100 Copenhagen, Denmark
Accepted: 22 April 2005
The zero-bias conductance of quantum dots coupled to ferromagnetic leads is investigated. In the strong-coupling regime, it is found that the conductance is a non-monotonic function of the angle between the magnetisation directions in the two contacts. This behaviour is an effect of the presence of the leads which induces an angle-dependent spin-split of the quantum dot states, and spin-flip transitions between the quantum dot states whenever the magnetisation directions of the leads are non-collinear, which enhances the current density at the chemical potential. In the weak-coupling regime, the system reverts to normal spin valve character.
PACS: 72.25.Mk – Spin transport through interfaces / 73.63.Kv – Quantum dots / 73.23.Hk – Coulomb blockade; single-electron tunneling
© EDP Sciences, 2005
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