113 research outputs found
A Green's function approach to transmission of massless Dirac fermions in graphene through an array of random scatterers
We consider the transmission of massless Dirac fermions through an array of
short range scatterers which are modeled as randomly positioned -
function like potentials along the x-axis. We particularly discuss the
interplay between disorder-induced localization that is the hallmark of a
non-relativistic system and two important properties of such massless Dirac
fermions, namely, complete transmission at normal incidence and periodic
dependence of transmission coefficient on the strength of the barrier that
leads to a periodic resonant transmission. This leads to two different types of
conductance behavior as a function of the system size at the resonant and the
off-resonance strengths of the delta function potential. We explain this
behavior of the conductance in terms of the transmission through a pair of such
barriers using a Green's function based approach. The method helps to
understand such disordered transport in terms of well known optical phenomena
such as Fabry Perot resonances.Comment: 22 double spaced single column pages. 15 .eps figure
Desempenho de híbridos top crosses de linhagens S3 de milho em três locais do Estado de São Paulo
Expressão sexual do mamoeiro sob diferentes lâminas de irrigação na Região Norte Fluminense
Seleção para tolerância ao alumínio em milho com base em parâmetros genéticos e análise multivariada
Aplicação aérea de fungicidas com diferentes equipamentos e volumes sobre a produtividade, qualidade de grãos e controle de doenças em arroz irrigado
Efeito de Estratégia de Suplementação com Concentrado no Desempenho de Cabras Mestiças Saanen, em Dois Sistemas de Produção
Performance and carcass traits of Santa Inês lambs finished with different sources of forage
Astronomical Distance Determination in the Space Age: Secondary Distance Indicators
The formal division of the distance indicators into primary and secondary leads to difficulties in description of methods which can actually be used in two ways: with, and without the support of the other methods for scaling. Thus instead of concentrating on the scaling requirement we concentrate on all methods of distance determination to extragalactic sources which are designated, at least formally, to use for individual sources. Among those, the Supernovae Ia is clearly the leader due to its enormous success in determination of the expansion rate of the Universe. However, new methods are rapidly developing, and there is also a progress in more traditional methods. We give a general overview of the methods but we mostly concentrate on the most recent developments in each field, and future expectations. © 2018, The Author(s)
Observações sôbre a presença de anticorpos para Toxoplasma gondii em cães da área suburbana do Rio de Janeiro
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