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Now showing items 21-30 of 186
Engenharia de defeitos em semicondutores de gap largo
(Universidade Federal de São Carlos, 2015-12-14)
Defects play a fundamental issue on physical properties of wide bandgap semiconductors
(WBS) due to the possibility of application in high temperature. This work shows the features of the defects in di erent kind of WBS ...
Propriedades físicas de modelos integráveis
(Universidade Federal de São Carlos, 2017-08-16)
In this thesis we tackled two di erent problems of quantum integrability. We derived nite sets of non-linear integral equations to describe physical properties of quantum chains invariant under the super-algebras su(2|1) ...
Ultracold bosons in random lattice potentials
(Universidade Federal de São Carlos, 2023-04-06)
The Bose-Hubbard model describes short-range interacting spinless bosons on a random lattice. This model is realized in ultracold atomic systems where quantum phase transitions can be observed. When loaded into a deep ...
Análise de segurança de criptografia quântica baseada em teletransporte
(Universidade Federal de São Carlos, 2021-02-04)
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 ...
Correlation between structure and optical properties of lead metasilicate glass-ceramic under high hydrostatic pressures
(Universidade Federal de São Carlos, 2022-09-21)
Glass structures are determined by not only composition, pressure, and temperature but also by the pressure and thermal histories in which the glass was submitted. In this thesis, a systematic study of these variables was ...
Influência da morfologia no comportamento magnético em aglomerado de CoTPP
(Universidade Federal de São Carlos, 2022-03-23)
The study of magnetic properties in organic molecules with transition metals has been intense in recent decades, mainly due to the ease of changing their magnetic behavior, either through the introduction of different types ...
Propriedades ópticas e magneto-ópticas de monocamadas de dicalcogenetos de metais de transição
(Universidade Federal de São Carlos, 2022-06-07)
Bidimensional (2D) materials are systems of great interest both from the fundamental physical point of view and for possible applications in electronics, optoelectronics and spintronics. In this thesis, the optical properties ...
Magnetoplasmons no sistema de elétrons superficiais sobre hélio líquido confinado em um canal parabólico
(Universidade Federal de São Carlos, 2003-04-15)
A lot of experimental and theoretical work have been performed in order to understand the collective modes of two-dimensional electron system (2DES) confined to restricted geometries. In particular, the system of surface ...
Estudo das propriedades estruturais e de transporte eletrônico em nanoestruturas de óxidos semicondutores e metálicos
(Universidade Federal de São Carlos, 2010-05-07)
The structural and transport features of oxide nanostructures synthesized by a vapour phase aproach: the VLS and VS methods were investigated in this work. ITO and In2O3 nanowires were characterized by using XRD, HRTEM and ...
Interação da matéria de vórtices com estruturas de defeitos : detecção das primeiras penetrações
(Universidade Federal de São Carlos, 2009-08-07)
This thesis results from a systematic study of the interactions between penetrated vortices and pinning centers carried out on structured superconductors films of YBCO, Nb and Pb. A regular array of pinning centers (antidots, ...