Spin Orbit Interaction
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Estudo do acoplamento spin-órbita de multipartículas confinadas em pontos quânticos semicondutores
Spin-orbit (SO) coupling provides a way for orbital degrees of freedom to influence spin states. As a result the spin dynamics is affected, thus making spin qubit (quantum version of bit, basic unit of information in the computational language) operations more complex. Furthermore, spin-orbit coupling leads to spin decoherence and relaxation due to phonons,
Publicado em: 2009
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2. Efeito Hall de spin em poços quânticos com acoplamento spin-órbita inter-subbanda / Spin Hall effect in quantum wells with intersubband spin-orbit coupling
A partir da teoria de resposta linear (formalismo de Kubo) calculamos a condutividade de spin $\sigma_^$ para um gás bidimensional de elétrons formado num poço quântico com duas subbandas devido a atuação de um novo tipo de interação spin-órbita [Bernardes et al. \textit{Phys. Rev. Lett.} \textbf, 076603 (2007) \&Calsaverini \textit{et al}. \textit{
Publicado em: 2009
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3. Correlação eletrônica e interação Spin - órbita dos elétrons em dois pontos quânticos acoplados
Nós desenvolvemos um estudo sistemático dos efeitos do confinamento quântico, tunelamento entre dois pontos quânticos, interação Coulombiana entre elétrons e interação spin-órbita sobre estrutura eletrônica e propriedade magnética dos pontos quânticos acoplados lateralmente InAs/GaAs. Os cálculos foram baseados na aproximação de Heitler - Lon
Publicado em: 2009
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4. EstatÃstica de contagem de carga e efeitos de interferÃncia em sistemas mesoscÃpicos
In this thesis we presented a detailed study about full counting statistics of transmitted charge and accumulated phase and the quantum interference corrections to the average conductance and the average shot-noise power in non-ideal ballistic chaotic cavities. In the theoretical analysis of this mesoscopic system, we obtained analytical expressions for the
Publicado em: 2009
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5. SPIN AND CORRELATION EFFECTS IN NANOSCOPIC TRANSPORT / EFEITOS DE SPIN E CORRELAÇÃO EM TRANSPORTE NANOSCÓPICO
We investigated spin polarized transport properties through a quantum dot connected with two terminals. An electric current that circulates in our system can have its polarization modulated with an external potential that controls the spin orbit coupling (Rashba effect). We studied the effect of spin polarization n a transistor constituted by a quantum dot w
Publicado em: 2005
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6. SU(3) model description of Be isotopes
Experimental data on light nuclei close to dripline suggests that as the nucleon number asymmetry increases, the shell structure from stability line is not preserved. In contrast with spherical shell model, Elliott's SU(3) model, uses a deformed multi-nucleon basis to describe nuclear states. The SU(3) symmetry is a strong feature of 1p shell nuclei, where s
Brazilian Journal of Physics. Publicado em: 2004-09
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7. Electron spin-phonon relaxation in quantum dots
We calculate the spin relaxation rates in parabolic quantum dots due to the phonon modulation of the spin-orbit interaction in presence of an external magnetic field. Both, deformation potential (DP) and piezoelectric (PE) electron-phonon couplings are included in the Pavlov-Firsov spin-phonon Hamiltonian. We demonstrate that the spin relaxation rates are pa
Brazilian Journal of Physics. Publicado em: 2004-06
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8. Novos desenvolvimentos e aplicaÃÃes de mÃtodos de quÃmica quÃntica para compostos de coordenaÃÃo com Ãons lantanÃdeos
Theoretical studies on lanthanide compounds were performed, and divided into three parts: (i) generalization of the Linderberg-Seamans equations for an s-p-d-f basis set; (ii) study of the ligand-to-lanthanide ion charge transfer transitions (LMCT) with the ZINDO98 program using the INDO/S semiempirical hamiltonian and (iii) a study of point charge and charg
Publicado em: 2003
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9. Efeitos de muitos corpos e propriedades de coerencia no processo de excitação de um atomo por impacto eletronico
In the chapter I first order many body theory ( FOMBT ) is applied to the calculation of diferential cross section for impact excitation of the 41S and 43S states of He by electrons at energies 40 eV, 60 eV and 80 eV. In the chapter II we use Martin-Schwinger many body Green s function techniques to develop a theory for excitation of meta-stable targets in f
Publicado em: 1980
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10. Continuous Stern-Gerlach effect: Principle and idealized apparatus
A nondestructive type of Stern-Gerlach effect for an individual electron is described that has been thoroughly demonstrated in experiments at the University of Washington. This “continuous Stern-Gerlach effect” makes use of an inhomogeneous magnetic field provided by a weak auxiliary magnetic bottle and is nondestructive in contrast to all previous versi