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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

Efeitos de desordem na transição metal-isolante de Mott / Efects of disorder on the Mott metal-insulator transition

Suárez Villagrán, Martha Yolima, 1984- 08 December 2009 (has links)
Orientador: Eduardo Miranda / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin / Made available in DSpace on 2018-08-14T07:53:33Z (GMT). No. of bitstreams: 1 SuarezVillagran_MarthaYolima_M.pdf: 2373759 bytes, checksum: 6ea9dc2028d28176c8fe83514187958a (MD5) Previous issue date: 2009 / Resumo: Determinamos o diagrama de fases do modelo de Hubbard desordenado como função da temperatura e interação por meio da Teoria Estatística Dinâmica de Campo Médio. As linhas espinoidais para o metal e isolante foram traçadas para desordem fraca e moderada, usando Monte Carlo Quântico para resolver o problema de uma impureza. Encontramos que a desordem desloca as linhas espinoidais para valores maiores de interação e temperaturas menores. Nosso estudo mostra que a região de coexistência do isolante e do metal sobrevive à introdução de desordem e preserva a transição de Mott, pelo menos para valores suficientemente pequenos de desordem. / Abstract: We determine the phase diagram of the disordered Hubbard Model as a function of temperature and interaction strength by means of the Statistical Dynamical Mean Field Theory. The metallic and insulating spinodal lines are traced for weak and moderate disorder using Quantum Monte Carlo as the impurity solver. We find that disorder pushes the spinodal lines to larger interactions and smaller temperatures. Our studies show that the coexistence region of insulator and metal survives the introduction of disorder and is a robust feature of the Mott transition, at least for sufficiently small disorder strength. / Mestrado / Física da Matéria Condensada / Mestra em Física

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