An effective model for strongly correlated electrons

Detalhes bibliográficos
Ano de defesa: 2019
Autor(a) principal: Xavier, Hernán Guillermo Bueno
Orientador(a): Ferraz Filho, Alvaro
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: PROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA
Departamento: Não Informado pela instituição
País: Brasil
Palavras-chave em Português:
Área do conhecimento CNPq:
Link de acesso: https://repositorio.ufrn.br/jspui/handle/123456789/27250
Resumo: In this work we examine an alternative effective formulation for the t-J model which is believed to capture the essential physics behind the underdoped regime of the highTc cuprates. After recasting the original problem into this representation, we check the consistency of the procedure and discuss some physical consequences of such a representation, including, the crossover between the regimes of small and large Fermi surfaces which is observed experimentally. We then explore the possiblity of constructing a path integral representation of the partition function of the the t-J model by departing from the formulation presented. Finally, we use the latter formalism to derive a continuum effective field theory in (2 + 1) spacetime dimensions which features small hole-like pockets near the nodal regions of the Brillouin zone along with an unconventional mechanism for superconductivity.