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Strong light-matter interaction in systems described by a modified Dirac equation
Peres, N. M. R.; Santos, Jaime E.The bulk states of some materials, such as topological insulators, are described by a modified Dirac equation. Such systems may have trivial and non-trivial phases. In this paper, we show that in the non-trivial phase a strong light-matter interaction exists in a two-dimensional system, which leads to an optical conductivity at least one order of magnitude larger than that of graphene.
Thermodynamics of a Potts-like model for a reconstructed zigzag edge in graphen...
Rodrigues, J. N. B.; Gonçalves, P. A. D.; Santos, Jaime E.; Castro Neto, A. H.Versão 'draft' ; We construct a three-color Potts-like model for the graphene zigzag edge reconstructed with Stone-Wales carbon rings in order to study its thermal equilibrium properties. We consider two cases which have different ground states: the edge with nonpassivated dangling carbon bonds and the edge fully passivated with hydrogen. We study the concentration of defects perturbing the ground-state config...
The Casimir spectrum revisited
Herdeiro, Carlos A. R.; Sampaio, Marco O. P.; Santos, Jaime E.We examine the mathematical and physical significance of the spectral density sigma(omega) introduced by Ford [Phys. Rev. D 38, 528 (1988)], defining the contribution of each frequency to the renormalised energy density of a quantum field. Firstly, by considering a simple example, we argue that sigma(omega) is well defined, in the sense of being regulator independent, despite an apparently regulator dependent d...
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