INVESTIGADORES
CABRA Daniel Carlos
artículos
Título:
Magnetism of Finite Graphene Samples: Mean-Field Theory compared with Exact Diagonalization and Quantum Monte Carlo Simulation
Autor/es:
HÉLÈNE FELDNER; ZI YANG MENG; ANDREAS HONECKER; DANIEL CABRA; STEFAN WESSEL; FAKHER F. ASSAAD
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2010 vol. 81 p. 1154161 - 1154165
ISSN:
1098-0121
Resumen:
The magnetic properties of graphene on finite geometries are studied
using a self-consistent mean-field theory of the Hubbard model. This
approach is known to predict ferromagnetic edge states close to the
zigzag edges in single-layer graphene quantum dots and nanoribbons. In
order to assess the accuracy of this method, we perform complementary
exact diagonalization and quantum Monte Carlo simulations. We observe
good quantitative agreement for all quantities investigated provided
that the Coulomb interaction is not too strong.
