Interaction-driven spin precession in quantum-dot spin valves

Details Interaction-driven spin precession in quantum-dot spin valves Interaction-driven spin precession in quantum-dot spin valves

2002-12-11

arxiv.org/abs/cond-mat/0212253v2

Phys. Rev. Lett. 90, 166602 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, version to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.166602

We analyze spin-dependent transport through spin valves composed of an interacting quantum dot coupled to two ferromagnetic leads. The spin on the quantum dot and the linear conductance as a function of the relative angle $\theta$ of the leads' magnetization directions is derived to lowest order in the dot-lead coupling strength. Due to the applied bias voltage spin accumulates on the quantum dot, which for finite charging energy experiences a torque, resulting in spin precession. The latter leads to a non-trivial, interaction-dependent, $\theta$-dependence of the conductance. In particular, we find that the spin-valve effect is reduced for all $\theta \neq \pi$.

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