Sign reversal of Hall conductivity and quantum confinement in graphene ribbons

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dc.creatorLiu, Junfeng
dc.creatorMa, Zhongshui
dc.date2009-04-01
dc.date.accessioned2026-07-07T12:59:01Z
dc.date.available2026-07-07T12:59:01Z
dc.descriptionCharacterized by zigzag and armchair boundaries, the narrow ribbons display the very different characteristics in Hall conductivities. It is shown that the multi-band-crossings occur in the energy spectrum for armchair ribbons, and the number of them depends on the width of ribbons. Theoretically, it is predicated that the conductivities exhibit drastic sign reversals for narrow ribbons as the Fermi energy sweep over the band-crossings. A new classification of armchair ribbons is suggested based on the emergence of a flat band in the energy spectrum only for odd armchair ribbons. The evolution of jumped Hall conductivities to step-like plateaus and the restore of density of states at the van Hove singularity in the limitation to graphene sheet have been analyzed.
dc.description11 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0904.0097
dc.identifierhttp://arxiv.org/abs/0904.0097
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/225440
dc.subjectMesoscale and Nanoscale Physics
dc.subjectMaterials Science
dc.titleSign reversal of Hall conductivity and quantum confinement in graphene ribbons
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