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Sources of negative tunneling magnetoresistance in multilevel quantum dots with ferromagnetic contacts

URN to cite this document:
urn:nbn:de:bvb:355-epub-231826
Koller, Sonja ; Paaske, Jens ; Grifoni, Milena
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Date of publication of this fulltext: 16 Jan 2012 06:36


Abstract

We analyze distinct sources of spin-dependent energy level shifts and their impact on the tunneling magnetoresistance (TMR) of interacting quantum dots coupled to collinearly polarized ferromagnetic leads. Level shifts due to virtual charge fluctuations can be quantitatively evaluated within a diagrammatic representation of our transport theory. The theory is valid for multilevel quantum dot ...

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