Dresden 2026 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Focus Session: Relaxation Timescales in Open Quantum Systems (joint session TT/DY)

DY 12.6: Vortrag

Montag, 9. März 2026, 17:45–18:00, CHE/0089

Coupling--energy driven pumping through quantum dots: The role of coherences — •Lukas Litzba¹, Gernot Schaller², Jürgen König¹, and Nikodem Szpak¹ — ¹Universität Duisburg-Essen, Duisburg, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany

We study the impact of off--resonant tunneling and coherences on the electron transport through quantum dots. We focus on two electron pump setups where first--order tunneling processes are suppressed and the pumping mechanism is exclusively driven by modulations of the coupling energy. For calculations we use an exact solution for a non--Coulomb interacting situation. The first setup is driven by a coupling and decoupling procedure of the quantum dot and the environment and the second setup by measurement--induced effects resembling the anti--Zeno effect. We show that both electron pumps are based on decoherence operations and modulations of the coupling energy and there is quantitative and qualitative agreement between them. Furthermore, we show that non--Markovian effects can increase the performance of the devices and are signatures for the importance of coherences in electron transport.

Keywords: electron pump; anti-Zeno effect; coupling energy; non--Markovian effects; off--resonant tunneling