619 citations
4 papers
Disorder Induced Localized States in Graphene
Vitor M. Pereira, F. Guinea, J. M. B. Lopes dos Santos +2
We consider the electronic structure near vacancies in the half-filled honeycomb lattice. It is shown that vacancies induce the formation of localized states. When particle-hole sy…
Geometric algebra and particle dynamics
Jose B. Almeida
In a recent publication the I showed how the geometric algebra , the algebra of 5-dimensional space-time, can generate relativistic dynamics from the simple principle th…
Weak ferromagnetism and spiral spin structures in honeycomb Hubbard planes
M A N Araujo, N M R Peres
Within the Hartree Fock- RPA analysis, we derive the spin wave spectrum for the weak ferromagnetic phase of the Hubbard model on the honeycomb lattice. Assuming a uniform magnetiza…
Transgression forms in dimension 4
Isabel M. C. Salavessa, Ana Pereira do Vale
We compute explicit transgression forms for the Euler and Pontrjagin classes of a Riemannian manifold of dimension 4 under a conformal change of the metric, or a change to a Ri…