Search
Now showing items 21-30 of 97
Mecânica quântica no espaço de fase não-comutativo e aplicações em termodinâmica
(Universidade Federal de São Carlos, 2016-08-26)
In this work we study theoretical aspects arising from the fact of considering a
quantum theory with general relations of noncommutativity. Through the quantum
mechanics in phase-space formalism in the Wigner-Weyl ...
Propriedades magnéticas de BiMn2O5 e Fe3O2BO3
(Universidade Federal de São Carlos, 2018-02-26)
In this work, an exploration of the synthesis and magnetoelectric properties of single-crystals of BiMn2O5 and a systematic study of the magnetic properties of Fe3O2BO3 are presented. Despite the unlike composition, both ...
Transmissão de emaranhamento através de cadeias de spins
(Universidade Federal de São Carlos, 2018-04-25)
In this thesis we studied the transmission of entangled states in unmodulated spin chains using a slight modification in the XY isotropic model (XX model) that describes a one-dimensional spin-1/2 chain. We have shown that ...
Estudo de dispositivos eletrônicos baseados em filmes de diamante dopados com boro
(Universidade Federal de São Carlos, 2018-01-29)
In this work, the main objective was the study of boron doped diamond films aiming the use of them as semiconductor material for electronic devices. Schottky diodes and a field effect transistor were the devices built with ...
Técnicas de difração de elétrons e de caracterizações elétricas e térmicas combinadas para análise de transformações de simetria em estruturas perovskitas distorcidas : caso das soluções sólidas (Pb1-xCax)TiO3
(Universidade Federal de São Carlos, 2017-03-03)
The main objective of this work was the unequivocally determination of the crystal symmetry
of distorted perovskite structure by direct and indirect methods, with the solid solution system
Pb1-xCaxTiO3 (PCT) as the case ...
Otimização do controle de Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae) por meio do parasitoide Cotesia flavipes (Cameron, 1891) (Hymenoptera: Braconidae) visando a redução de custos
(Universidade Federal de São Carlos, 2018-03-26)
Brazil is the world’s largest producer of sugarcane. However, this agricultural crop
is attacked by pests, especially Diatraea saccharalis. Its control in Brazil is carried out
mainly by the action of the caterpillar ...
Transporte eletrônico em nanofios de SnO2 dopado com Sb: transição metal-isolante induzida pela dopagem e fotocondutividade persistente
(Universidade Federal de São Carlos, 2019-03-15)
In this work we studied the structural, optical and electronic transport properties of intrinsic and doped SnO2 nanowires with different concentrations of antimony (Sb) grown by the Vapor-Liquid-Solid mechanism (VLS). ...
Propriedades de sistemas de pontos quânticos semicondutores acoplados e sua resposta óptica
(Universidade Federal de São Carlos, 2017-10-31)
The study of doped semiconductor quantum dots with magnetic impurities has been a challenging task when adding spin-orbit coupling and exchange interaction with asymmetry effects. The combination of all these factors within ...
Electronic and optical properties of Quasi-2D nanostructures and exfoliated systems
(Universidade Federal de São Carlos, 2017-10-30)
This thesis is aiming to study, according to a theoretical approaches, the electronic and optical properties of quasi-2D semiconductor quantum systems. Using the k · p model as basis we obtained a satisfactory set of results ...
Emaranhamento intrínseco em sistemas tipo-Dirac
(Universidade Federal de São Carlos, 2018-03-06)
Dirac equation is supported by a $SU(2) \otimes SU(2)$ group structure, such that its solutions describe two discrete degrees of freedom, intrinsic parity and spin, which in general are entangled. In this work we will ...