Charge and spin dynamics in interacting quantum dots

Janine Splettstoesser, Michele Governale, Jürgen König, and Markus Büttiker
Phys. Rev. B 81, 165318 – Published 28 April 2010

Abstract

The transient response of a quantum dot with strong Coulomb interaction to a fast change in the gate potential, as well as the stationary ac response to a slow harmonic variation in the gate potential are computed by means of a real-time diagrammatic expansion in the tunnel-coupling strength. We find that after a fast switching, the exponential relaxation behavior of charge and spin are governed by a single time constant each, which differ from each other due to Coulomb repulsion. We compare the response to a step potential with the RC time extracted from the ac response.

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  • Received 9 April 2010

DOI:https://doi.org/10.1103/PhysRevB.81.165318

©2010 American Physical Society

Authors & Affiliations

Janine Splettstoesser1,2, Michele Governale3, Jürgen König4, and Markus Büttiker5

  • 1Institut für Theoretische Physik A, RWTH Aachen University, D-52056 Aachen, Germany
  • 2JARA–Fundamentals of Future Information Technology, Germany
  • 3School of Physical and Chemical Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
  • 4Theoretische Physik, Universität Duisburg-Essen and CeNIDE, D-47048 Duisburg, Germany
  • 5Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland

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Issue

Vol. 81, Iss. 16 — 15 April 2010

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