Theory of frequency-dependent spin current noise through correlated quantum dots

Details Theory of frequency-dependent spin current noise through correlated quantum dots Theory of frequency-dependent spin current noise through correlated quantum dots

2009-07-02

arxiv.org/abs/0907.0475v2

Phys. Rev. B 81, 241305(R) (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We analyze the equilibrium and non-equilibrium frequency-dependent spin current noise and spin conductance through a quantum dot in the local moment regime. Spin current correlations are shown to behave markedly differently from charge correlations: Equilibrium spin cross-correlations are suppressed at frequencies below the Kondo scale, and are characterized by a universal function that we determine numerically for zero temperature. For asymmetrical quantum dots dynamical spin accumulation resonance is found for frequencies of the order of the Kondo energy. At higher temperatures surprising low-frequency anomalies related to overall spin conservation appear.

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