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O: Fachverband Oberflächenphysik
O 11: 2D Materials I: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)
O 11.2: Vortrag
Montag, 16. März 2020, 11:00–11:15, WIL C107
Energy dissipation on suspended graphene quantum dots — •Alexina Ollier1,2, Marcin Kisiel1, Urs Gysin1, and Ernst Meyer1 — 1Department of Physics, University of Basel,Klingelbergstr. 82, 4056 Basel, Switzerland — 2Swiss Nanoscience Institute, Klingelbergstrasse 82, 4056 Basel
Here we report on a low temperature (T=5K) measurement of striking singlets or multiplets of dissipation peaks above graphene nanodrums surface. The stress present in the structure leads to formation of few nanometer sized graphene quantum dots ribbons (GQDRS) and the observed dissipation peaks are attributed to tip-induced charge state transitions in quantum-dot- like entities. The dissipation peaks strongly depend on the external magnetic field (B=0T-2T), the behavior we attributed to crossover from quantum dot carrier confinement to the confinement by magnetic field.