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We present a detailed study for the finite-frequency current noise of a Kondoquantum dot in presence of a magnetic field by using a recently developed realtime functional renormalization group approach [Phys. Rev. B $\mathbf{83}$,201303(R) (2011)]. The scaling equations are modified in an external magneticfield; the couplings and non-local current vertices become stronglyanisotropic, and develop new singularities. Consequently, in addition to thenatural emission threshold frequency, $\hbar\omega = |eV|$, a correspondingsingular behavior is found to emerge in the noise spectrum at frequencies$\hbar \omega \approx |eV\pm B|$. The predicted singularities are measurablewith present-day experimental techniques.

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