Browsing Física - PPGF by CNPq Subject "CIENCIAS EXATAS E DA TERRA::FISICA::FISICA GERAL"
Now showing items 1-14 of 14
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The memristive response in solids
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 07/08/2023)In this Master Thesis, we have investigated basic ingredients of the theory of solid state transport, namely the Drude like conductivity and the activation of nonequilibrium charge carriers subjected to a relaxation time, ... -
Otimização dos campos de proteção nas técnicas de desacoplamento dinâmico contínuo
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 15/09/2023)In this research project, we investigate the method known as \textit{continuous dynamical decoupling}, which is based on the use of continuously applied external fields to maximize the fidelity of quantum logical operations ... -
Teoria de controle ótimo aplicada a sistemas quânticos abertos
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 10/11/2023)This thesis, grounded in the field of quantum computing, explores diverse and crucial topics for the advancement of this area. Firstly, we introduce an innovative "double-bang" solution using optimal control theory for ... -
Análise de segurança de criptografia quântica baseada em teletransporte
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 04/02/2021)We prove that the teleportation based quantum cryptography protocol presented in [Opt. Commun. 283, 184 (2010)], which is built using only orthogonal states encoding the classical bits that are teleported from Alice to ... -
Estudo das propriedades ópticas de filmes finos e poços quânticos de GaAsPN/GaPN
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 08/09/2016)Diluted nitride III-V semiconductor leagues have physical properties that make them interesting for applications on optoelectronic devices. The possibility to lattice matching GaAsPN with silicon makes this semiconductor ... -
Structural properties of nanoscopic ring systems and their optical response
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 30/03/2016)In this thesis, the electronic and structural properties of nanostructured systems were studied aiming to get a realistic model for quantum rings, potentially adaptable for quantum dots. To attain these goals, several ... -
Nanofios de germânio : síntese, caracterização estrutural, propriedades elétricas e aplicações
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 09/08/2016)The element germanium is part of the history of electronic equipment based on semiconductor from its early days with the invention of the transistor, until today with current research related to growth of germanium ... -
Emaranhamento intrínseco em sistemas tipo-Dirac
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 06/03/2018)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 ... -
Uma introdução à invariância conforme na Teoria das Cordas
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 11/10/2018)In this work we study the formalism of Conformal Field Theory (CFT) and apply it to the theory of strings and superstrings. We also use the BRST quantization technique to obtain the string spectrum together with the ... -
Vidros: sólidos ou líquidos? Uma análise via simulação computacional
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 10/10/2019)For many centuries there were different definitions of what glass would be, this discussion persists to current days. Is glass a solid or liquid material? In this work, we answer this question through computational ... -
Formulações semiclássicas da mecânica quântica: uma análise do oscilador singular por meio do formalismo de Weyl-Wigner e trajetórias quânticas
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 10/02/2020)The usual quantum mechanics formalism does not address relevant points of the semiclassical limit. In this work two theoretical approaches will be considered: Bohmian mechanics and the Weyl-Wigner formulation. The singular ... -
Algoritmos quânticos para resolução de equações diferenciais: análise de complexidade e aplicabilidade
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 11/02/2022)This work consists in a complexity analysis of an algorithm for solving differential equations, which shares common characteristics with other algorithms designed for the same task. Operations such as state preparation, ... -
Electromagnetically induced transparency under effects of light-mediated interactions, entanglement generation, and Fock states detection
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 25/10/2022)This thesis presents a brief compilation of the works developed during my doctorate, and can be divided basically into three main parts. In the first one, we show the changes caused by considering long-range interactions ... -
Propriedades microestruturais e elétricas de nanoestruturas de WO3 puras e dopadas com Mn
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 21/05/2024)Tungsten trioxide (WO3) is an n-type wide bandgap semiconductor that has been widely studied due to its properties, being used in the generation of electricity “water splitting”, catalysis, gas sensors, among others. ...