Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-06-23
New J. Phys. 11, 095022 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
19 pages, published version, several references added, small changes to conclusions
Scientific paper
10.1088/1367-2630/11/9/095022
We study the conductance through two types of graphene nanostructures: nanoribbon junctions in which the width changes from wide to narrow, and curved nanoribbons. In the wide-narrow structures, substantial reflection occurs from the wide-narrow interface, in contrast to the behavior of the much studied electron gas waveguides. In the curved nanoribbons, the conductance is very sensitive to details such as whether regions of a semiconducting armchair nanoribbon are included in the curved structure -- such regions strongly suppress the conductance. Surprisingly, this suppression is not due to the band gap of the semiconducting nanoribbon, but is linked to the valley degree of freedom. Though we study these effects in the simplest contexts, they can be expected to occur for more complicated structures, and we show results for rings as well. We conclude that experience from electron gas waveguides does not carry over to graphene nanostructures. The interior interfaces causing extra scattering result from the extra effective degrees of freedom of the graphene structure, namely the valley and sublattice pseudospins.
Adagideli Inanc
Baranger Harold U.
Richter Katrin
Wimmer Michael
Wurm J.
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