Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 3: Quantum Dots and Wires 1: Transport and Electronic Properties
HL 3.8: Talk
Monday, September 5, 2022, 12:00–12:15, H32
Temperature-dependence of current peaks in InAs double quantum dots — •Olfa Dani1, Robert Hussein2, Johannes C. Bayer1, Sigmund Kohler3, and Rolf J. Haug1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Hanover, Germany — 2Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Jena, Germany — 3Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain
We investigate electron transport through asymmetrically coupled InAs double quantum dots. Measurements of the resonances of single-electron tunneling shows a quite strong temperature dependence of those coherent current peaks. Their width and background increase with temperature in the range of 1.5-21 K, which indicates an influence of the substrate phonons. The broadening of such peaks can be modeled with rather good precision and can be fully explained with quantum dissipation [1] modeled by two baths, the one coupling to the dot occupation, the other to the inter-dot current. Application of magnetic fields helps us to identify the different quantum dot states. [1] Olfa Dani, Robert Hussein, Johannes C. Bayer, Sigmund Kohler, Rolf J. Haug, Temperature-dependent broadening of coherent current peaks in InAs double quantum dots, arXiv:2204.06333 (2022)