Conductance Through Graphene Bends and Polygons
arXiv:0804.0246 · doi:10.1103/PhysRevB.78.235411
Abstract
We investigate the transmission of electrons between conducting nanoribbon leads oriented at multiples of 60 degrees with respect to one another, connected either directly or through graphene polygons. A mode-matching analysis suggests that the transmission at low-energies is sensitive to the precise way in which the ribbons are joined. Most strikingly, we find that armchair leads forming 120-degree angles can support either a large transmission or a highly suppressed transmission, depending on the specific geometry. Tight-binding calculations demonstrate the effects in detail, and are also used to study transmission at higher energies as well as for zigzag ribbon leads.
14 pages, 21 figures
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- Carbon nanoelectronics: unzipping tubes into graphene ribbons
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- Electronic States of Wires and Slabs of Topological Insulators: Quantum Hall Effects and Edge Transport
- Interfaces Within Graphene Nanoribbons
- Effective Time Reversal Symmetry Breaking and Energy Spectra of Graphene Armchair Rings
- Conductance quantization in graphene nanoconstrictions with mesoscopically smooth but atomically stepped boundaries
- Crossed Andreev reflection versus electron transfer in graphene nanoribbons
- Electronic transport of folded graphene nanoribbons
- Decomposition into Propagating and Evanescent Modes of Graphene Ribbons