Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 46: Poster Session: Complex Fluids, Soft Matter, Active Matter, Glasses and Granular Materials
DY 46.20: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P2
Theory of scanning gate Microscopy in graphene — •Xianzhang Chen1,2, Guillaume Weick2, Dietmar Weinmann2, and Rodolfo Jalabert2 — 1Lanzhou Center for Theoretical Physics, and Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, Gansu 730000, China — 2Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France
The conductance of graphene nanoribbons and quantum point contacts under scanning gate microscopy tip has been systematically studied. The first- and second-order conductance corrections caused by the tip potential disturbance in armchair graphene are expressed in terms of the scattering states of the unperturbed structure using a scattering approach for a noninvasive probe. The second-order term prevails in the conductance plateaus for armchair graphene strips, but the first-order corrections dominate everywhere at the conductance steps for graphene shaped in quantum point contact. For the stronger tip, where the perturbation approach breaks down, we discovered that conductance corrections exhibit resonance effects at specific values of the tip potential width and strength, which can be regarded as carriers trapped below the tip. Additionally, the numerical results for zigzag graphene also follow the weak probe theory.