Disorder induced Coulomb gaps in graphene constrictions with different aspect ratios
arXiv:1011.2091 · doi:10.1063/1.3544580
Abstract
We present electron transport measurements on lithographically defined and etched graphene nanoconstrictions with different aspect ratios including different lengths (L) and widths (W). A roughly length-independent disorder induced effective energy gap can be observed around the charge neutrality point. This energy gap scales inversely with the width even in regimes where the length of the constriction is smaller than its width (L<W). In very short constrictions, we observe both resonances due to localized states or charged islands and an elevated overall conductance level (0.1-1e2/h), which is strongly length-dependent in the gap region. This makes very short graphene constrictions interesting for highly transparent graphene tunneling barriers.
4 pages, 4 figures
References in corpus (12)
- Energy Band Gap Engineering of Graphene Nanoribbons
- Chaotic Dirac billiard in graphene quantum dots
- Graphene Nano-Ribbon Electronics
- Room Temperature All Semiconducting sub-10nm Graphene Nanoribbon Field-Effect Transistors
- Energy gaps in etched graphene nanoribbons
- Conductance quantization and transport gap in disordered graphene nanoribbons
- Edge disorder induced Anderson localization and conduction gap in graphene nanoribbons
- Coulomb blockade in graphene nanoribbons
- Quantum dot behavior in graphene nanoconstrictions
- Electron-Hole Crossover in Graphene Quantum Dots
- Transport gap in side-gated graphene constrictions
- Density inhomogeneity driven percolation metal-insulator transition and dimensional crossover in graphene nanoribbons