Buscar
Itens para a visualização no momento 21-30 of 43
Propriedades estáticas e dinâmicas de portadores em heteroestruturas semicondutoras.
(Universidade Federal de São Carlos, 2002-10-30)
We have studied the dynamic and the stationary properties of carriers in semiconductor
heterostructures submitted to electric fields AC and DC and to magnetic fields
within the effective-mass approximation based on ...
Estudo do efeito da correlação do alvo no espalhamento de elétrons por moléculas pequenas na faixa de energias baixas e intermediária.
(Universidade Federal de São Carlos, 2004-03-26)
In this present work, we have carried out a theoretical investigation on the
influence of the target electronic correlation on electron elastic scattering by molecules.
Calculated differential, integral and momentum-transfer ...
Processos de relaxação em sistemas quânticos e álgebra de operadores não-lineares
(Universidade Federal de São Carlos, 2006-02-24)
On this thesis some aspects of relaxation processes and decoherence processes using deformed
algebras of the harmonic oscillator, particularly the generalized deformed algebra (GDA algebra)
and Kerr algebra were studied.Two ...
Regras de ocupação e influência de dopantes trivalentes em matrizes cerâmicas transparentes de PLZT 9/65/35
(Universidade Federal de São Carlos, 2009-10-01)
In this work, were investigated the occupancy of rare-earth ions in lattice site of the ferroelectric system (Pb,La)(Zr,Ti)O3, or PLZT. The influence on the structural, microestructural, dielectric, ferroelectric, optical ...
O efeito Casimir dinâmico e decoerência
(Universidade Federal de São Carlos, 2008-07-03)
In this thesis we first demonstrate that the inevitable action of the environment can be substantially weakened when considering appropriate nonstationary quantum systems. Beyond protecting quantum states against decoherence, ...
Estudo de efeitos quânticos em redes de junções Josephson SNS e SIS com composição Nb-CuxAlyOz-Nb através da indução de vórtices por conseqüência do tamanho de rede
(Universidade Federal de São Carlos, 2009-10-16)
In this thesis we studied the quantum effects in networks of Josephson junctions under the induction of vortices and as a consequence of the size of the sample itself. For this, it also was carried out all the instrumentation ...
Modelos magnéticos com frustração e diluição
(Universidade Federal de São Carlos, 2006-12-08)
In this work, we investigate the effect of dilution and frustration in the thermodynamic properties and the phase diagrams using the quasi-two-dimensional Heisenberg and Ising models. We use the Zubarev Green´s function ...
Dinâmica de coerência e decoerência de estados em redes de osciladores quânticos dissipativos.
(Universidade Federal de São Carlos, 2004-07-02)
In this thesis we studied the coherence and decoherence dynamics of states in
a network of dissipative quantum oscillators. The coherence dynamics refers to
the swap and recurrence process of states between the oscillators ...
Efeitos da interação de plasma na absorção ótica em super-rede randômica de pontos quânticos.
(Universidade Federal de São Carlos, 2004-09-13)
In this work the ground and first excited states of the electron are calculated
in interacting one-dimensional, two-dimensional lattices and multilayers
of cylindrical quantum dots containing at the most an electron and ...
Ansatz de Bethe para cadeias quânticas de spin-1 com condições de contorno
(Universidade Federal de São Carlos, 2002-03-21)
The procedure for obtaining integrable open spin chain Hamiltonians via reflection
matrices explicitly carried out for some three-state vertex models. We have considered
the 19-vertex models of Zamolodchikov-Fateev and ...