Dresden 2020 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 66: Poster Session Transport
TT 66.12: Poster
Donnerstag, 19. März 2020, 15:00–19:00, P2/EG
Electronic Tranport in Graphene Nanoribbons with Edge Disorder — •Tom Rodemund1,2, Fabian Teichert2, and Jörg Schuster1,3 — 1Center for Microtechnologies, Technische Universität Chemnitz, Chemnitz, Germany — 2Institute of Physics, Technische Universität Chemnitz, Chemnitz, Germany — 3Fraunhofer Institute for Electronic Nano Systems (ENAS), Chemnitz, Germany
Graphene possesses many interesting properties like high charge carrier mobilities and concentration. This makes it particularly suited for electronic applications. However, while using Graphene in form of nanoribbons (GNRs) edge disorder cannot be avoided. We study the influence of edge roughness on electron conductance using a density-functional-based tight-binding model to calculate the conductance of rough GNRs. We analyze large ensembles of GNRs with random edges and varying chirality in order to gain insight into the electronic structure.
A GNR represents a quasi-one-dimensional system with disorder and is thus expected to have strongly localized states. This leads to an exponential dependence of the conductance on the length of the ribbon with a characteristic localization length. We express the localization length as a function of roughness, width and chirality of the system.