Based on the cluster perturbation solution of the Hubbard Hamiltonian for a 2D honeycomb lattice, we present quasi-particle band structures of nanoribbons at half filling as a function of on-site electron-electron (e-e) repulsion. We show that, at moderate values of e-e interaction, ribbons with armchair-shaped edges exhibit an unexpected semimetallic behavior, recovering the original insulating character only at larger values of U.
Reentrant metallicity in the Hubbard model: the case of honeycomb nanoribbons / Manghi, Franca; Petocchi, F.. - In: PHYSICA SCRIPTA. - ISSN 0031-8949. - STAMPA. - 89:(2014), pp. 075802-075808. [10.1088/0031-8949/89/7/075802]
Reentrant metallicity in the Hubbard model: the case of honeycomb nanoribbons
MANGHI, Franca;
2014
Abstract
Based on the cluster perturbation solution of the Hubbard Hamiltonian for a 2D honeycomb lattice, we present quasi-particle band structures of nanoribbons at half filling as a function of on-site electron-electron (e-e) repulsion. We show that, at moderate values of e-e interaction, ribbons with armchair-shaped edges exhibit an unexpected semimetallic behavior, recovering the original insulating character only at larger values of U.
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