Charge and spin dynamics in interacting quantum dots

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 of 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 relaxation 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.

5 pages, 3 figures, published version

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• Non-geometric pumping effects on the performance of interacting quantum-dot heat engines
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• Fermionic duality: General symmetry of open systems with strong dissipation and memory