Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: 2D Materials I: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)

CPP 17.2: Talk

Monday, March 16, 2020, 11:00–11:15, WIL C107

Energy dissipation on suspended graphene quantum dots — •Alexina Ollier^1,2, 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.