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

Moca, Pascu Catalin and Simon, P. and Chung, C. H. and Zaránd, Gergely Attila (2014) Finite-frequency-dependent noise of a quantum dot in a magnetic field. PHYSICAL REVIEW B, 89 (15). ISSN 2469-9950

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Abstract

We present a detailed study for the finite-frequency current noise of a Kondo quantum dot in the 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, ℏω = |eV |, a corresponding singular behavior is found to emerge in the noise spectrum at frequencies ℏω ≈ |eV ±B|. The predicted singularities are measurable with present-day experimental techniques.

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