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Interação plasmon-fônon LO em superredes semicondutoras
(Universidade Federal de São Carlos, 2008-10-07)
This work presents a Raman investigation of the optical vibrations in highly doped In-GaAs/InP and GaAs/AlGaAs superlattices (SL s). The InGaAs/InP SL s grown with different
periods were analyzed using polarized Raman ...
Origem dos momentos magnéticos localizados em ligas de cromo com metais de transição por oscilações de Friedel
(Universidade Federal de São Carlos, 2006-08-02)
The fundamental magnetic properties of chromium and its alloys Cr(1¡x)Nb(x) and Cr(1¡x)V(x), were investigated with the aim to achieve a better comprehension about the nature of the spin density waves. Was dened the edge ...
O estudo do limite de transporte interfilamentar de supercorrentes em amostras supercondutoras de BSCCO.
(Universidade Federal de São Carlos, 2006-03-15)
In this work, we have studied the behavior of the line H*(T) in filamentary samples of BSCCO, which were grown by the LFZ technique, Laser Floating Zone. Previously studied in other specimens prepared by specific routes ...
Estudo do modelo de Rabi no contexto de sistemas quânticos abertos
(Universidade Federal de São Carlos, 2009-01-27)
The Rabi Hamiltonian describes the interaction between a two-level atom and a single mode of the quantized electromagnetic field. In this work we study numerically and analytically the dynamics of the Rabi hamiltonian ...
Efeitos de interações elétron-elétron e spin-órbita nas propriedades magneto-eletrônicas de magneto-transporte de sistemas confinados.
(Universidade Federal de São Carlos, 2003-10-10)
Effects of the direct and exchange electron-electron interaction, external magnetic
field, symmetry of the charge carriers confining potential, radius, material g-factor, and
also of the spin-orbit interaction in zincblende ...
Estudo sistematico das propriedades termodinâmicas e criticalidade de filmes finos e super-redes magnéticas.
(Universidade Federal de São Carlos, 2004-12-10)
In this work we will study through the differential operator technique the surface
effect in anisotropic spin ½ quantum Heisenberg model, through theory of effective field
(EFT), of a two-spins cluster, in case of simple ...
Dispersão dielétrica em materiais ferroelétricos.
(Universidade Federal de São Carlos, 2004-12-13)
In the last decades, the high frequency dielectric response has been one of
the most studied issues in the ferroelectricity area. The main dielectric
characteristic is the strong dependence of the dielectric parameters ...
Magnetorresistência túnel ressonante e acoplamento magnético em heteroestruturas epitaxiais.
(Universidade Federal de São Carlos, 2004-10-29)
In the context of spin electronics, this doctorate thesis presents an
experimental study of spin polarized transport in epitaxial heterostructures as planar
magnetic tunnel junctions formed by semiconductors and metallic ...
Espectroscopia Mössbauer aplicada ao estudo da liga aço baixo carbono-Al nitretada.
(Universidade Federal de São Carlos, 2005-03-18)
We presented in this work a study of the influence of the thickness of Al thin film
deposited in substratum of low carbon steel. Alloys of steel low carbon and
aluminum are used broadly in automobile and aerospace industries. ...
Cálculos de primeiros princípios para BaO.
(Universidade Federal de São Carlos, 2005-02-28)
In this work we present first principles calculations with Density Functional Theory,
DFT, using norm-conserving pseudopotentials. Initially, we perform calculations
of structural properties for metallic barium, Ba, in the ...