Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 15, Pages 3390-3393Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3390
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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 Kekule-like current patterns; These zero-conductance dips are connected with a pronounced negative magnetoresistance.
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