Transições de fase entre dois regimes com propriedades radicalmente diferentes são bastante comuns na natureza. Tais transições podem ser contínuas (suaves) ou ocorrer de maneira abrupta. As transições abruptas podem ser modeladas por transições de fase descontínuas e são observadas, por exemplo, em ecologia, epidemiologia e economia. Em diversos casos (com consequências catastróficas) essas...
There is a class of physical systems that do not obey the laws of Classical Mechanics but they either obey Quantum Mechanics, these are the mesoscopic systems. In this work, we present a collection of studies of mesoscopic systems on various aspects. From classical signatures in quantum systems, to processes that lead a quantum system to have so-called "classic" behavior. As we show, if we...
Nesta Apresentação vamos apresentar brevemente sobre a ciência da complexidade. Esta ciência lida com sistemas formados por muitos componenetes interagentes, dando origem a comportamentos coletivos não triviais.
Exemplos destes sistemas são encontrados em física, biologia, sociologia e economia.
Gostaria de apresentar também as técnicas matemáticas e computacionais que são usadas para...
In recent years, a vast quantity of work has been done analysing nonlinear systems in two-dimensional parameter spaces. As a result, noticeable periodic windows, such as Arnold tongues and shrimp-shaped structures, have been identified embedded in the chaotic regions for a large diversity of non-linear systems. Several interesting properties of dynamics are associated with periodic windows,...
Aceleradores de partículas são excelentes fontes de neutrinos, oferecendo maior controle e precisão nos estudos de oscilação, quando comparados com as fontes naturais. Em particular, os futuros desenvolvimentos na chamada Fonteira de Intensidade permitirão conhecer não somente os ângulos de mistura, mas também a hierarquia das massas e a violação de CP, se esta existir. Experimentos de base...
The interest in two-dimensional (2D) layered materials increased after the successful isolation of monolayer graphene reported in 2004 [1]. The monolayer of hexagonally-linked carbon atoms made it possible to study a brand-new set of electric, and optical phenomena, but the lack of a band gap imposes some difficulties to graphene’s application in electronics, despite its high carrier mobility....
By an appropriate representation of the fermionic variables in theWess-Zumino quantum mechan-
ics, we show it entails a non-linear generalization of the Jaynes-Cumming (JC) model in quantum
optics. Actually, we show that the constraints corresponding to the canonical quantization of the
fermionic variables de?ne a real eight-dimensional manifold and that one point in it realizes the JC
model....
The growing interest in new materials with promising electronic properties, such as thermoelectricity and superconductivity, among others, has awakened the interest scientific community. A family of compounds known as Zintl compounds, has been extensively studied. The Zintl compounds are governed by the charge equilibrium between donor ions and complex structures, and generally present cells...
In the case in which no new resonances are directly produced at the LHC, new physics effects are best studied using effective field theory methods. In this scenario, the contribution of new heavy particles can be parametrized in terms of an effective lagrangian that contains higher-dimensional operators made of Standard Model (SM) fields. Largest effects are expected to come from operators...
