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TT: Fachverband Tiefe Temperaturen
TT 37: Quantum Coherence, Quantum Information Systems 1
TT 37.11: Talk
Wednesday, March 13, 2013, 12:15–12:30, H19
Nonequilibrium Landau-Zener-Stückelberg spectroscopy in a double quantum dot — •Peter Nalbach1, Johannes Knörzer1, and Stefan Ludwig2 — 1I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany — 2Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, D-80539 München, Germany
We study theoretically nonequilibrium Landau-Zener-Stückelberg (LZS) dynamics in
a driven double quantum dot (DQD) including dephasing and, importantly, energy
relaxation due to environmental fluctuations. We derive effective nonequilibrium
Bloch equations. These allow us to identify clear signatures for LZS oscilations
observed but not recognized as such in experiments
[1] and to identify the full
environmental fluctuation spectra acting on a DQD given experimental data as in
[1]. Herein we
find that super-Ohmic fluctuations, typically due to phonons, are the main relaxation
channel for a detuned DQD whereas Ohmic fluctuations dominate at zero detuning.
[1] Petersson et al., Phys. Rev. Lett. 105, 246804 (2010)