Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: TR: Nanoelectronics I: Quantum Dots, Wires, Point Contacts 1

TT 29.4: Vortrag

Donnerstag, 25. März 2010, 10:15–10:30, H19

Non-equilibrium current and relaxation dynamics of a charge-fluctuating quantum dot — •Sabine Andergassen¹, Christoph Karrasch¹, Mikhail Pletyukhov¹, Dirk Schuricht¹, Laszlo Borda², Volker Meden¹, and Herbert Schoeller¹ — ¹Institut für Theoretische Physik A und JARA - Fundamentals of Future Information Nanotechnology, RWTH Aachen University — ²Physikalisches Institut, Universität Bonn

We study the steady-state current in a minimal model for a quantum dot dominated by charge fluctuations and analytically describe the time evolution into this state. The current is driven by a finite bias voltage across the dot. The Coulomb interaction of the localized dot electron with the lead electrons is treated using two complementary renormalization group methods. We find interesting non-equilibrium effects which can in general not be explained by simply considering the bias voltage as an additional infrared cutoff. The relaxation dynamics shows characteristic oscillations as well as an interplay of exponential and power-law decay.