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7 papers · 1 filter
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…
Inducing energy gaps in graphene monolayer and bilayer
R. M. Ribeiro, N. M. R. Peres, J. Coutinho +1
In this paper we propose a mechanism for the induction of energy gaps in the spectrum of graphene and its bilayer, when both these materials are covered with water and ammonia mole…
On the magnetically driven ferroelectric phase in GdMnO3
J. L. Ribeiro
At room temperature, GdMnO3 is a paraelectric and paramagnetic with a distorted perovskite structure of orthorhombic symmetry (space group Pnma). On cooling, it undergoes a phase t…
Symmetry and magnetically driven ferroelectricity in rare-earth manganites RMnO3 (R=Gd, Tb, Dy)
J. L. Ribeiro
This work investigates the magnetically driven ferroelectricity in orthorhombic manganites RMnO3 (R=Gd, Dy or Tb) from the point of view of the symmetry. The method adopted general…
Electron waves in chemically substituted graphene
N. M. R. Peres, F. D. Klironomos, S. -W. Tsai +3
We present exact analytical and numerical results for the electronic spectra and the Friedel oscillations around a substitutional impurity atom in a graphene lattice. A chemical do…
Biased bilayer graphene: semiconductor with a gap tunable by electric field effect
Eduardo V. Castro, K. S. Novoselov, S. V. Morozov +6
We demonstrate that the electronic gap of a graphene bilayer can be controlled externally by applying a gate bias. From the magneto-transport data (Shubnikov-de Haas measurements o…