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Comportamento multicrítico no modelo de Heisenberg frustrado: transições de fases clássica e quântica
(Universidade Federal de São Carlos, 2011-09-01)
In this work we study the critical behavior of systems described by the Anysotropic- Heisenberg model of spin 1/2 with competitive interactions (J1-J2 Model) on planes, and interplane nearest-neighbor interactions. We ...
Efeito Aharonov-Bohm em partículas neutras
(Universidade Federal de São Carlos, 2011-03-14)
In classical Physics, the motion of an electrically charged particle is affected only by the presence of a magnetic field if the particle enters a region of space in which the field is present. Meanwhile, in quantum Physics, ...
Geometria e simetrias do emaranhamento
(Universidade Federal de São Carlos, 2011-05-20)
In the present work we present a geometric method to identify and measure the degree of entanglement of a two-qubit state. It is based on writing a map of the system state, from a non-unitary transformation. By introducing ...
Ensino significativo de física por projetos: campanha de economia de energia elétrica
(Universidade Federal de São Carlos, 2011-07-29)
This work presents a strategy of meaningful learning based on projects. In the education proposal, steps are suggested to the development of the general design, regardless of the subject to be studied. These steps envolve ...
A equação de Yang-Baxter para modelos de vértices com três estados
(Universidade Federal de São Carlos, 2011-03-02)
In this work we study the solutions of the Yang-Baxter equation associated to nineteen vertex models invariant by the parity-time symmetry from the perspective of algebraic geometry. We determine the form of the algebraic ...
Correlacões quânticas: medidas e simetrias
(Universidade Federal de São Carlos, 2011-06-17)
In this thesis, we explore two sort of quantum correlations: entanglement and quantum discord. We present a geometric method to identify and measure the degree of entanglement based on symmetries of vectors and matrices ...
Estrutura eletrônica de anéis quânticos
(Universidade Federal de São Carlos, 2011-08-09)
The nanoscopic structures with ring topology, or quantum rings, have attracted the interest due to their unique rotational symmetry and the possibility of checking fundamental quantum phenomena. Among them, the study of ...
Processamento e caracterização de cerâmicas transparentes do sistema ferroelétrico PMN-PT dopado com lantânio
(Universidade Federal de São Carlos, 2011-12-17)
In this work, one of the goals was the stabilization and/or optimization of the perovskita phase in the (Pb,La)(Mg1/3Nb2/3)O3+PbTiO3 (PLMN-PT) e Pb(Mg1/3Nb2/3)O3+PbTiO3+La2O3 (PMN-PT:La) powders in order to obtain ceramics ...
Efeito de absorção em espalhamento de elétrons por molécula de formaldeido
(Universidade Federal de São Carlos, 2011-10-02)
This master's project's main objective is to study the effects of absorption in the elastic scattering of electrons by molecules of formaldehyde (CH2O). We calculated differential cross sections (SCD), integral cross ...
Síntese e caracterização de compósitos multiferroicos de manganita La: Sr e titanatos de Ba e Sr
(Universidade Federal de São Carlos, 2011-03-18)
In this paper, we seek to prepare composite multiferroics extrinsic whose potential for technological applications, especially in the electronics industry, and the possibility of new phenomena of fundamental scientific ...