12,171 research outputs found
Electron Confinement Induced by Diluted Hydrogen-like Ad-atoms in Graphene Ribbons
We report the electronic properties of two-dimensional systems made of
graphene nanoribbons which are patterned with ad-atoms in two separated
regions. Due to the extra electronic confinement induced by the presence of the
impurities, we find resonant levels, quasi-bound and impurity-induced localized
states, which determine the transport properties of the system. Regardless of
the ad-atom distribution in the system, we apply band-folding procedures to
simple models and predict the energies and the spatial distribution of those
impurity-induced states. We take into account two different scenarios: gapped
graphene and the presence of randomly distributed ad-atoms in a low dilution
regime. In both cases the defect-induced resonances are still detected. Our
findings would encourage experimentalist to synthesize these systems and
characterize their quasi-localized states employing, for instance, scanning
tunneling spectroscopy (STS). Additionally, the resonant transport features
could be used in electronic applications and molecular sensor devices.Comment: 12 pages, 11 figures, submitted (minor changes
New housing supply: what do we know and how can we learn more?
This paper reviews the literature on new housing supply. The paper starts by summarizing the results of the empirical studies on housing supply, showing that overall these studies reject the hypothesis of a perfectly elastic housing supply and reveal that housing supply is negatively related with financial costs, inflation and sales delay while showing inconclusive results with respect to the construction costs. In addition, we review a recent branch of the literature on housing supply that uses strategic interaction models. There is evidence that the housing market is not well described by the perfect competition model. Thus, a deeper understanding of housing supply can be achieved by considering theoretical models that take into account the strategic interaction between land developers and by using data where the unit of analysis is the land developer.Housing supply; price elasticity of supply, strategic interaction.
Electronic transport through bilayer graphene flakes
We investigate the electronic transport properties of a bilayer graphene
flake contacted by two monolayer nanoribbons. Such a finite-size bilayer flake
can be built by overlapping two semiinfinite ribbons or by depositing a
monolayer flake onto an infinite nanoribbon. These two structures have a
complementary behavior, that we study and analyze by means of a tight-binding
method and a continuum Dirac model. We have found that for certain energy
ranges and geometries, the conductance of these systems oscillates markedly
between zero and the maximum value of the conductance, allowing for the design
of electromechanical switches. Our understanding of the electronic transmission
through bilayer flakes may provide a way to measure the interlayer hopping in
bilayer graphene.Comment: 11 pages, 8 figure
- …