Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Transport: Fluctuations and Noise

TT 3.11: Vortrag

Montag, 25. Februar 2008, 12:45–13:00, H 2053

Non-Markovian dephasing in a structured environment — •Clive Emary — TU Berlin, Sekr. PN 7-1, Institut für Theoretische Physik, Hardenbergstr. 36, D-10623 BERLIN, Deutschland

We describe a theory of the non-Markovian behaviour of a quantum system coupled to an environment whose dynamics are governed by a generalised master equation. Such an environment can be, in general, far from equilibrium and exhibit strongly non-Gaussian fluctuations. We calculate the influence of such fluctuations on the system from a Dyson-like equation for the full system-environment propagator in Liouvillian space. We consider particular application to mesoscopic systems, such as a double quantum dot charge qubit, coupled to an environment of fluctuating charges. In the limit of classical environment with a “pure dephasing” coupling to a qubit, we obtain a relation between the long-time qubit dephasing rate, and a generalised full-counting statistics of the environment.