Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: Correlated Electrons: Quantum Impurities, Kondo Physics 1

TT 15.5: Talk

Monday, March 26, 2012, 17:45–18:00, BH 334

Finite-frequency noise of the anisotropic Kondo model at finite bias and magnetic field: a real-time renormalization group analysis — •Sarah Müller, Sabine Andergassen, Dirk Schuricht, Mikhail Pletyukhov, and Herbert Schoeller — Institut für Theorie der Statistischen Physik und JARA - Fundamentals of Future Information Nanotechnology, RWTH Aachen University

The non-equilibrium electron transport through mesoscopic systems dominated by spin fluctuations is affected by the relaxation and decoherence processes resulting from the coupling of the spin to its environment. The understanding of their origin and their impact on the transport properties is of fundamental importance. We here study the finite-frequency noise of a quantum dot in the Kondo regime in presence of a magnetic field by using the real-time renormalization group in frequency space [1]. Based on a systematic expansion in the reservoir-system coupling, we integrate out the reservoir degrees of freedom and provide an analytic solution of the resulting two-loop RG equations in the weak-coupling regime. In particular, the relaxation and decoherence rates characterizing the non-equilibrium transport of mesoscopic systems emerge during the RG flow. We extend the approach of Ref. [2] to derive analytic expressions for the finite-frequency noise in the stationary state. We discuss the results in relation to recent experiments [3].
H. Schoeller, Eur. Phys. J. Special Topics 168, 179 (2009).
D. Schuricht and H. Schoeller, Phys. Rev. B 80, 075120 (2009).
J. Basset et al., arXiv:1110.1570.