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

C. P. Moca, I. Weymann, G. Zaránd

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We analyze the equilibrium and nonequilibrium 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 crosscorrelations are suppressed at frequencies below the Kondo scale and are characterized by a universal function that we determine numerically for T=0 temperature. For asymmetrical quantum dots dynamical spin accumulation resonance is found at the Kondo energy, ω∼ TK. At higher temperatures surprising low-frequency anomalies related to overall spin conservation appear.

Original languageEnglish
Article number241305
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number24
DOIs
Publication statusPublished - Jun 17 2010

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Semiconductor quantum dots
quantum dots
Conservation
Temperature
conservation
anomalies
low frequencies
moments
temperature
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Theory of frequency-dependent spin current noise through correlated quantum dots. / Moca, C. P.; Weymann, I.; Zaránd, G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 24, 241305, 17.06.2010.

Research output: Contribution to journalArticle

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