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18 papers · 1 filter
The nonlinear N-membranes evolution problem
José Francisco Rodrigues, Lisa Santos, José Miguel Urbano
The parabolic N-membranes problem for the p-Laplacian and the complete order constraint on the components of the solution is studied in what concerns the approximation, the regular…
A tight-binding approach to uniaxial strain in graphene
Vitor M. Pereira, A. H. Castro Neto, N. M. R. Peres
We analyze the effect of tensional strain in the electronic structure of graphene. In the absence of electron-electron interactions, within linear elasticity theory, and a tight-bi…
Dirac electrons in graphene-based quantum wires and quantum dots
N. M. R. Peres, J. N. B. Rodrigues, T. Stauber +1
In this paper we analyse the electronic properties of Dirac electrons in finite-size ribbons and in circular and hexagonal quantum dots made of graphene.
Distortion of the perfect lattice structure in bilayer graphene
Vitor M. Pereira, R. M. Ribeiro, N. M. R. Peres +1
We consider the instability of bilayer graphene with respect to a distorted configuration in the same spirit as the model introduced by Su, Schrieffer and Heeger. By computing the…
Conductivity of suspended and non-suspended graphene at finite gate voltage
T. Stauber, N. M. R. Peres, A. H. Castro Neto
We compute the DC and the optical conductivity of graphene for finite values of the chemical potential by taking into account the effect of disorder, due to mid-gap states (unitary…
Dynamical Functions of a 1D Correlated Quantum Liquid
J. M. P. Carmelo, D. Bozi, K. Penc
We extend to initial ground states with zero spin density m = 0 the expressions provided by the pseudofermion dynamical theory (PDT) for the finite-energy one- and two-electron spe…