Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.33: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Open system dynamics with energy-dependent tunnel couplings — •Jens Schulenborg1, Maarten Wegewijs2, and Janine Splettstoesser1 — 1Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Göteborg, Sweden — 2Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich, Germany & JARA-FIT
A good theoretical understanding of the dynamics of tunnel-coupled electronic open nanosystems is crucial for the current strive towards controlled few-particle emission in the context of, e.g., metrology or quantum optics with electrons. However, while often experimentally relevant[1], most analytical studies on decay dynamics with strong local Coulomb interaction have so far neglected the energy structure of the tunnel barriers themselves, focussing only on the wideband limit.
Recently, we have shown the so-called fermion-parity duality[2] to be particularly insightful for such time-dependent problems. This work extends our approach to a general class of fermionic open systems with energy-dependent bare couplings in the Markovian, sequential tunneling limit. For the simplest relevant example of a spin-degenerate interacting single-level quantum dot, we show the duality to be similarly powerful as in the wideband limit. Even in an environment far away from equilibrium, it enables us to analyze the entire dot decay dynamics, including time-dependent particle- and energy current, in terms of simple-to-understand stationary equilibrium observables.
J. D. Fletcher et al., Phys. Rev. Lett. 111, 216807 (2013)
J. Schulenborg et al., Phys. Rev. B 93, 081411 (2016)