Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.5: Poster

Mittwoch, 16. März 2011, 14:00–18:00, P3

Different time scales in the dynamics of an interacting quantum dot — •L.Debora Contreras-Pulido¹, Janine Splettstoesser¹, Michele Governale², and Jürgen König³ — ¹RWTH-Aachen University, Aachen, Germany — ²Victoria University of Wellington, Wellington, New Zealand — ³Universität Duisburg-Essen and CeNIDE, Duisburg, Germany

The recent theoretical and experimental analysis of the controlled emission of charge (as well as current correlations) from a quantum capacitor, shows its potential application in quantum information, in nanoelectronics operating in Gigahertz frequencies, and also in the study of a few-particle physics, including the dynamics of nanoscale systems [1]. We extend the study presented in [2] for the time-dependent decay after a step pulse has been applied to a single-level quantum dot with Coulomb interaction and coupled to an electronic reservoir. Our results show that besides the independent decay of charge and spin, an additional time scale appears which we calculate up to second order in a perturbation expansion in the tunneling coupling. We relate the decaying quantity to deviations of the electron-hole occupation and the symmetry of the Anderson Model. Importantly, the decay rate is independent of the level position.
See e.g. A. Mahé et al., Phys. Rev. B 82, 201309(R) (2010); M. Moskalets, P. Samuelsson, M. Büttiker Phys. Rev. Lett. 100, 086601 (2008), and references therein.
J. Splettstoesser, M. Governale, J. König, M. Büttiker Phys. Rev. B 81, 165318 (2010).