Ferromagnetism without flat bands in thin armchair nanoribbons

Details Ferromagnetism without flat bands in thin armchair nanoribbons Ferromagnetism without flat bands in thin armchair nanoribbons

2010-05-12

arxiv.org/abs/1005.2126v1

Eur. Phys. Jour. B75, 511, (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

37 pages, 12 figures, in press at Eur. Phys. Jour. B

Scientific paper

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.

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