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Estudo de primeiros princípios das propriedades eletrônicas de novos materiais derivados do grafeno : as nanofitas e nanofios
(Universidade Federal de São Carlos, 2012-09-05)
In this thesis, we study new materials derived from graphene, like nanowires and nanoribbons, with numerical calculations based on the density functional theory (DFT) and the non-equilibrium Green functions (NEGF). We will ...
Flux avalanches in patterned superconducting thin films: ac susceptibility, morphology and related studies
(Universidade Federal de São Carlos, 2013-04-12)
Avalanches are sudden dramatic phenomena that occur in nature. The technique of magneto-optical imaging (MOI) has allowed us to observe abrupt flux entrances in superconductors, the so-called ux avalanches, due to ...
Superposição de estados comprimidos de dois modos e aplicações em informação quântica
(Universidade Federal de São Carlos, 2019-03-07)
In this work, we present a new class of quantum states for applications in quantum
metrology and quantum information, the states here named as “Even EPR” and “Odd
EPR”. We present a review of the basic concepts of ...
Controle das propriedades estatísticas do campo e biestabilidade óptica em eletrodinâmica quântica de cavidades
(Universidade Federal de São Carlos, 2013-03-27)
We investigate in this thesis the control of absorptive optical bistability in a standing wave optical cavity filled with a collection of two and three-level noninteracting atoms weakly coupled to a single electromagnetic ...
Magneto luminescência em diodos de tunelamento ressonante contendo pontos quânticos de InAs
(Universidade Federal de São Carlos, 2011-03-15)
In this work, we have studied the spin polarization of carriers in n-type resonant tunneling diodes (RTDs) of GaAs/AlGaAs which incorporates a single layer of InAs selfassembled quantum dots in the center of the GaAs quantum ...
Experimentos em ondas e acústica para auxiliar o processo ensino e aprendizagem da física no ensino médio
(Universidade Federal de São Carlos, 2012-04-13)
This paper describes the development of experimental activities with the aid of the microcomputer as a measuring tool in the laboratory teaching of physics, as well as an account of his experience in the classroom. Using ...
Ondas gravitacionais e o espectro de anisotropia tensorial na presença de neutrinos cosmológicos
(Universidade Federal de São Carlos, 2012-07-10)
In this work we have studied the evolution of primordial gravitational waves coupled to anisotropic stress tensor of cosmological neutrinos. As in a radiation dominated universe, in a universe dominated by radiation and ...
Otimizando a eficiência de células solares baseadas em nanoestruturas semicondutoras quaternárias
(Universidade Federal de São Carlos, 2020-02-28)
Solar cells composed of semiconductor materials with gap energies and different structures, commonly known as Multijunction, have been the record holders for efficiency in converting solar to electric energy in recent ...
Comunicação quântica baseada no teletransporte em variáveis contínuas
(Universidade Federal de São Carlos, 2014-12-12)
In this Thesis we study in details one of the most astonishing application of quantum mechanics which totally departs from our common sense: quantum teleportation in continuous variables. We present a review of the postulates ...
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2
(Universidade Federal de São Carlos, 2019-05-02)
We investigated the structural, optical and magnetic properties of two nanoparticles oxide systems: In2O3, prepared by the high energy mechanical milling process, and (Sn1-xCex)O2 produced by the Pechini method, using ...