Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Quantum Dots and Wires: Transport (joint session HL/TT)

TT 21.2: Vortrag

Dienstag, 18. März 2025, 11:30–11:45, H13

Non-Markovian higher-order electron pump: improvement of efficiency — •Lukas Litzba, Jürgen König, and Nikodem Szpak — Fakultät für Physik, Universität Duisburg-Essen, Lotharstraße 1, Duisburg 47057, Germany

We consider an electron pump that consists of a non--interacting quantum dot and electron baths. Our pumping setup utilizes only higher--order tunneling processes, which are purely quantum mechanical and have no classical analog. In order to study higher order tunneling--mechanism and non--Markovian effects, we extend the exact Heisenberg equation and the Laplace transform technique to time--dependent Hamiltonians and apply this technique to our model. Thereby, we identify parameter ranges which lead to a significant increase of the current flowing through the quantum dot and an improvement of the energetic efficiency of these processes.

Keywords: electron pump; non-Markov effects; quantum dots; transport