Zero-Conductance Resonances due to Flux States in Nanographite Ribbon Junctions

Details Zero-Conductance Resonances due to Flux States in Nanographite Ribbon Junctions Zero-Conductance Resonances due to Flux States in Nanographite Ribbon Junctions

1999-07-15

arxiv.org/abs/cond-mat/9907212v2

Physical Review Letters, vol.84, 3390-3393 (2000).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures: published in Phys. Rev. Lett. minor changes in text, figures and references

Scientific paper

10.1103/PhysRevLett.84.3390

The electronic transport properties through junctions in nanographite ribbons are investigated using the Landauer approach. In the low-energy regime ribbons with zigzag boundary have a single conducting channel of edge states. The conductance as a function of the chemical potential shows a rich structure with sharp dips of zero conductance. Each zero-conductance resonance is connected with a resonant state which can be interpreted as the superposition of two degenerate flux states with Kekul\'e-like current patterns. These zero-conductance dips are connected with a pronounced negative magneto resistance.

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