This paper analyzes the boundary term of the Hilbert-Einstein action for an FRW metric, and uses it to set the conditions of the Einstein’s Field Equations. By means of the energy conservation equation, we identify a new ...

We present an alternative and efficient way for calculating the superlattice Green function for discrete systems. Theidea is to consider the superlattices as a crystal with the unit cell having the size of the superlattice ...

Graphene Superlattices (GSs) have attracted a lot of attention due to its peculiar properties as well as its possible technological implications. Among these characteristics we can mention: the extra Dirac points in the ...

Con el fin de hacer una pequeña aportación para la celebración del 2005, proclamado como Año Internacional de la Física, se presenta un esbozo de los trabajos realizados por Einstein en 1905, así como un conjunto de ensayos ...

We calculate the transition energy from the first level of holes to the first level of electrons for cubic InxGa1−xN/InyGa1−yN quantum wells. We employ the empirical tight binding approach with an sp3s* orbital basis, ...

The experiment is described which shows that Coulomb interaction spreads with a limit velocity and thus this kind of interaction cannot be considered as so called “instantaneous action at a distance”

In this paper we are reporting the computation for the Nonlinear Optical Rectification (NOR) and the Second and Third Harmonic Generation (SHG and THG) related with electronic states of asymmetric double Si-δ-doped quantum ...

The electronic structure and the transport phenomena of d-MIGFETs have been studied in an AlxGa1 xAs host matrix. The subband structure and mobility calculations were performed within the effective mass approximation and ...

It is shown that the generally accepted definition of the Poynting vector and the energy flux vector defined by means of the energy density of the electromagnetic field (Umov vector) lead to the prediction of the different ...

In this work, we address the ubiquitous phenomenon of Fano resonances in bilayer graphene. We consider that this phenomenon is as exotic as other phenomena in graphene because it can arise without an external extended ...