Finite-frequency-dependent noise of a quantum dot in a magnetic field

Abstract

We present a detailed study for the finite-frequency current noise of a Kondo quantum dot in presence of a magnetic field by using a recently developed real time functional renormalization group approach [Phys. Rev. B $83$, 201303(R) (2011)]. The scaling equations are modified in an external magnetic field; the couplings and non-local current vertices become strongly anisotropic, and develop new singularities. Consequently, in addition to the natural emission threshold frequency, $\hslash \omega =|eV|$, a corresponding singular behavior is found to emerge in the noise spectrum at frequencies $\hslash \omega \approx |eV\pm B|$. The predicted singularities are measurable with present-day experimental techniques.

17 pages, 18 figures

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• Emission Noise in an Interacting Quantum Dot: Role of Inelastic Scattering and Asymmetric Coupling to the Reservoirs
• Transport in a hybrid normal-topological superconductor Kondo model
• Finite frequency current noise in the Holstein model
• Spin-resolved dynamical conductance of correlated large-spin magnetic molecules
• Finite-frequency noise of interacting single-electron emitters: spectroscopy with higher noise harmonics
• Double Quantum Dot scenario for spin resonance in current noise
• Mechanism of current noise spectrum in a nonequilibirum Kondo dot system
• Dynamical spin accumulation in large-spin magnetic molecules
• Spin versus charge noise from Kondo traps
• Finite-frequency noise in a non-interacting quantum dot
• Non-symmetrized quantum noise in a Kondo quantum dot