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TT: Fachverband Tiefe Temperaturen
TT 3: Transport: Quantum Dots, Quantum Wires, Point Contacts
TT 3.6: Talk
Monday, March 20, 2017, 10:45–11:00, HSZ 201
Fano stability diagram of a symmetric triple quantum dot — •Michael Niklas, Andreas Trottmann, Andrea Donarini, and Milena Grifoni — Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany
The Fano factor stability diagram of a C3v symmetric triangular quantum dot is analysed for increasing electron fillings N. At low filling, conventional Poissonian and sub-Poissonian behavior, caused by the interplay of electron-electron interactions and Fermi statistics, is found. At larger filling, N≥ 2, super-Poissonian noise and a peculiar bias voltage dependence of the Fano factor are observed at Coulomb and interference blockade. An analysis of the Fano map unravels a nontrivial electron bunching mechanism arising from the presence of degenerate many-body states combined with orbital interference and Coulomb interactions.