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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

SISTEMAS QUÂNTICOS DISCRETOS INCLUINDO SIMETRIA SL(2;C) E APLICAÇÕES EM RESSONÂNCIA MAGNÉTICA NUCLEAR

Cius, Danilo 27 February 2018 (has links)
Submitted by Angela Maria de Oliveira (amolivei@uepg.br) on 2018-05-03T12:34:24Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Danilo Cius.pdf: 2128036 bytes, checksum: 5b2c47a2a56fc484a69be66ca861ff21 (MD5) / Made available in DSpace on 2018-05-03T12:34:24Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Danilo Cius.pdf: 2128036 bytes, checksum: 5b2c47a2a56fc484a69be66ca861ff21 (MD5) Previous issue date: 2018-02-27 / Este trabalho tem como principal objetivo investigar a dinâmica de spin-1=2 no contexto de sistemas quânticos não-hermitianos. Propõe-se um modelo fenomenológico heurístico que inclui simetria dinâmica SL(2;C), cujo operador Hamiltoniano não-hermitiano efetivo de uma única partícula de dois níveis é empregado para simular a dinâmica coletiva de um ensemble de spin- 1=2. O modelo teórico é elaborado a partir da análise do decaimento da magnetização líquida em um experimento constituído de um ensemble de núcleos de 31P (com spin nuclear I = 1=2) de uma amostra de H3PO4, via técnica de Ressonância Magnética Nuclear. Verifica-se que as magnetizações experimentais evidenciam a validade do modelo teórico. / This work aims to investigating the dynamics of spin-1=2 in the context of non-Hermitian quantum systems. It is proposed a heuristic phenomenological model embedding SL(2;C) dynamical symmetry, whose the effective non-Hermitian Hamiltonian operator of a single particle is employed to mimic the damped dynamics of an ensemble of spin-1=2. The theorical model is built by the decay on net magnetization analysis in an experiment made up of an ensemble of 31P nuclei (spin I = 1=2) of H3PO4 sample by applying Nuclear Magnetic Resonance technique. It is verified that the experimental magnetizations emphasize the validity of the theoretical model.

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