Nonequilibrium frequency-dependent noise through a quantum dot: A real-time functional renormalization group approach

C. P. Moca, P. Simon, C. H. Chung, G. Zaránd

Research output: Article

27 Citations (Scopus)

Abstract

We construct a real time current-conserving functional renormalization group (RG) scheme on the Keldysh contour to study frequency-dependent transport and noise through a quantum dot in the local moment regime. We find that the current vertex develops a nontrivial nonlocal structure in time that is governed by a new set of RG equations. Solving these RG equations, we compute the complete frequency and temperature dependence of the noise spectrum. For voltages that are large compared to the Kondo temperature (i.e., eVk BTK), two sharp antiresonances are found in the noise spectrum at frequencies ω=±eV and, correspondingly, two Kondo-assisted peaks appear in the ac conductance through the dot.

Original languageEnglish
Article number201303
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number20
DOIs
Publication statusPublished - máj. 10 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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