Ferromagnetism without flat bands in thin armchair nanoribbons
Department of Theoretical Physics, University of Debrecen, 4010 Debrecen, Hungary
Corresponding author: a email@example.com
Revised: 30 March 2010
Published online: 26 May 2010
Describing by a Hubbard type of model a thin armchair graphene ribbon in the armchair hexagon chain limit, one shows in exact terms, that even if the system does not have flat bands at all, at low concentration a mesoscopic sample can have ferromagnetic ground state, being metallic in the same time. The mechanism is connected to a common effect of correlations and confinement.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010