Moire bands in twisted double-layer graphene

Details Moire bands in twisted double-layer graphene Moire bands in twisted double-layer graphene

2010-09-21

arxiv.org/abs/1009.4203v1

PNAS 108, 12233 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

A moire pattern is formed when two copies of a periodic pattern are overlaid with a relative twist. We address the electronic structure of a twisted two-layer graphene system, showing that in its continuum Dirac model the moire pattern periodicity leads to moire Bloch bands. The two layers become more strongly coupled and the Dirac velocity crosses zero several times as the twist angle is reduced. For a discrete set of magic angles the velocity vanishes, the lowest moire band flattens, and the Dirac-point density-of-states and the counterflow conductivity are strongly enhanced.

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