8,053 research outputs found
Electron Fabry-Perot interferometer with two entangled magnetic impurities
We consider a one-dimensional (1D) wire along which single conduction
electrons can propagate in the presence of two spin-1/2 magnetic impurities.
The electron may be scattered by each impurity via a contact-exchange
interaction and thus a spin-flip generally occurs at each scattering event.
Adopting a quantum waveguide theory approach, we derive the stationary states
of the system at all orders in the electron-impurity exchange coupling
constant. This allows us to investigate electron transmission for arbitrary
initial states of the two impurity spins. We show that for suitable electron
wave vectors, the triplet and singlet maximally entangled spin states of the
impurities can respectively largely inhibit the electron transport or make the
wire completely transparent for any electron spin state. In the latter case, a
resonance condition can always be found, representing an anomalous behaviour
compared to typical decoherence induced by magnetic impurities. We provide an
explanation for these phenomena in terms of the Hamiltonian symmetries.
Finally, a scheme to generate maximally entangled spin states of the two
impurities via electron scattering is proposed.Comment: 19 page
A simple deterministic self-organized critical system
We introduce a new continuous cellular automaton that presents self-organized
criticality. It is one-dimensional, totally deterministic, without any kind of
embedded randomness, not even in the initial conditions. This system is in the
same universality class as the Oslo rice pile system, boundary driven interface
depinning and the train model for earthquakes. Although the system is chaotic,
in the thermodynamic limit chaos occurs only in a microscopic level.Comment: System slightly modified. New results on Liapunov exponents.
Submitted for publication (8 pages
Chaos in black holes surrounded by gravitational waves
The occurrence of chaos for test particles moving around Schwarzschild black
holes perturbed by a special class of gravitational waves is studied in the
context of the Melnikov method. The explicit integration of the equations of
motion for the homoclinic orbit is used to reduce the application of this
method to the study of simple graphics.Comment: 15 pages, LaTex
Chaos around a H\'enon-Heiles-inspired exact perturbation of a black hole
A solution of the Einstein's equations that represents the superposition of a
Schwarszchild black hole with both quadrupolar and octopolar terms describing a
halo is exhibited. We show that this solution, in the Newtonian limit, is an
analog to the well known H\'enon-Heiles potential. The integrability of orbits
of test particles moving around a black hole representing the galactic center
is studied and bounded zones of chaotic behavior are found.Comment: 7 pages Revte
Effect of Static Disorder in an Electron Fabry-Perot Interferometer with Two Quantum Scattering Centers
In a recent paper -- F. Ciccarello \emph{et al.}, New J. Phys. \textbf{8},
214 (2006) -- we have demonstrated that the electron transmission properties of
a one-dimensional (1D) wire with two identical embedded spin-1/2 impurities can
be significantly affected by entanglement between the spins of the scattering
centers. Such effect is of particular interest in the control of transmission
of quantum information in nanostructures and can be used as a detection scheme
of maximally entangled states of two localized spins. In this letter, we relax
the constraint that the two magnetic impurities are equal and investigate how
the main results presented in the above paper are affected by a static disorder
in the exchange coupling constants of the impurities. Good robustness against
deviation from impurity symmetry is found for both the entanglement dependent
transmission and the maximally entangled states generation scheme.Comment: 4 pages, 5 figure
Nanosized superconducting constrictions
Nanowires of lead between macroscopic electrodes are produced by means of an
STM. Magnetic fields may destroy the superconductivity in the electrodes, while
the wire remains in the superconducting state. The properties of the resulting
microscopic Josephson junctions are investigated.Comment: 3 pages,3 eps figures include
Dinâmica espaço-temporal do parque caffeiro da Região de Três Pontas - MG.
A região de Três Pontas é uma das regiões cafeeiras mais importantes do Brasil e do mundo. O município é considerado o maior produtor mundial de café. Por esse motivo, conhecer a extensão e a localização desse parque cafeeiro torna-se de extrema importância. O objetivo desse trabalho foi analisar esse parque cafeeiro no tempo e no espaço, por meio de geotecnologias. No trabalho foram utilizadas imagens TM/Landsat de quatro diferentes datas, contemplando um período de sete anos de estudo. Foram confeccionados os mapas de uso da terra para os anos de 2000, 2003, 2005 e 2007. Por meio de ferramentas de análise espacial do sistema de informação geográfica SPRING, conclui-se que, durante esse período, o parque cresceu 7,45%. As áreas de café em produção aumentaram 11,24%, o que provavelmente elevou a produtividade da região. Não foram encontrados padrões de mudança no crescimento do parque
Hybridization-related correction to the jellium model for fullerenes
We introduce a new type of correction for a more accurate description of
fullerenes within the spherically symmetric jellium model. This correction
represents a pseudopotential which originates from the comparison between an
accurate ab initio calculation and the jellium model calculation. It is shown
that such a correction to the jellium model allows one to account, at least
partly, for the sp2-hybridization of carbon atomic orbitals. Therefore, it may
be considered as a more physically meaningful correction as compared with a
structureless square-well pseudopotential which has been widely used earlier.Comment: 16 pages, 10 figure
Anomalous Hall effect in superconductors with spin-orbit interaction
We calculate the anomalous Hall conductance of superconductors with
spin-orbit interaction and with either uniform or local magnetization. In the
first case we consider a uniform ferromagnetic ordering in a spin triplet
superconductor, while in the second case we consider a conventional s-wave spin
singlet superconductor with a magnetic impurity (or a diluted set of magnetic
impurities). In the latter case we show that the anomalous Hall conductance can
be used to track the quantum phase transition, that occurs when the spin
coupling between the impurity and electronic spin density exceeds a certain
critical value. In both cases we find that for large spin-orbit coupling the
superconductivity is destroyed and the Hall conductance oscillates strongly.Comment: 10 pages, 6 figure
Organização e sensibilização para o manejo florestal comunitário em assentamento rural.
O manejo florestal comunitário é um processo social desenvolvido em um contexto que envolve um grupo de pessoas. Neste artigo apresenta-se uma descrição compreensiva das técnicas empregadas no processo de organização e sensibilização de um grupo de produtores rurais, para a implementação do manejo florestal comunitário (MFC), sendo este um dos objetivos do projeto "Organização comunitária em apoio ao manejo florestal em assentamento rural" executado no assentamento ?Nilson Campos? (Jacy ?Paraná, Porto Velho-RO), proposta aprovada pelo Projeto de Apoio ao Manejo Florestal Sustentável na Amazônia ? ProManejo. Tendo como referência os estudos sobre trabalho com grupos e ações coletivas para o manejo florestal, discute-se o contexto social em que a comunidade se insere, e a proposta metodológica de trabalho em grupo, tendo as Oficinas como espaço comunicacional e o uso de música como ferramenta de base para a discussão e reflexão no grupo. O objetivo é trazer contribuições para a práxis do trabalho com grupos e extensão florestal e para as discussões teóricas sobre a gestão concertada de recursos
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