Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-03-05
Phys. Rev. B 80, 045410 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8+ pages, 8 figures
Scientific paper
10.1103/PhysRevB.80.045410
Graphene antidot lattices have recently been proposed as a new breed of graphene-based superlattice structures. We study electronic properties of triangular antidot lattices, with emphasis on the occurrence of dispersionless (flat) bands and the ensuing electron localization. Apart from strictly flat bands at zero-energy (Fermi level), whose existence is closely related to the bipartite lattice structure, we also find quasi-flat bands at low energies. We predict the real-space electron density profiles due to these localized states for a number of representative antidot lattices. We point out that the studied low-energy, localized states compete with states induced by defects on the superlattice scale in this system which have been proposed as hosts for electron spin qubits. We furthermore suggest that local moments formed in these midgap zero-energy states may be at the origin of a surprising saturation of the electron dephasing length observed in recent weak localization measurements in graphene antidot lattices.
Kindermann Markus
Stojanovic Vladimir M.
Vanevic Mihajlo
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