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Angular conductance resonances of quantum dots non-collinearly coupled to ferromagnetic leads
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Theoretical Magnetism.
2005 (English)In: Europhysics Letters, Vol. 70, no 6, 796-802 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2005. Vol. 70, no 6, 796-802 p.
Keyword [en]
Spin transport through interfaces, Quantum dots, Coulomb blockade; single-electron tunneling
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-77151OAI: oai:DiVA.org:uu-77151DiVA: diva2:105063
Available from: 2006-03-13 Created: 2006-03-13 Last updated: 2012-03-18

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http://www.edpsciences.org/articles/epl/abs/2005/12/epl8774/epl8774.html

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Fransson, Jonas

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