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Type: Artigo de periódico
Title: Insulator-to-metal crossover induced by local spin fluctuations in strongly correlated systems
Author: Craco, L
Abstract: We study the simplified Hubbard (SH) model in the presence of a transverse field in the infinite-dimension limit. The relevant one-particle Green's functions of the model are obtained by means of a perturbative treatment of the hopping and of the transverse field around the atomic limit. We consider an analytical solution for the impurity problem. It is shown that this solution is very accurate in describing the spectral properties of the heavy particles of the SH model for intermediate and strong values of the on-site Coulomb interaction U. We find that for large values of U an insulator-metal transition takes place as a function of the transverse field. We analyse the metallic phase through the behaviour of the density of states and those of th(e) optical conductivity and static resistivity. Our results for the latter quantity agree with what is observed in experiments on Bi2Sr2CuOy.
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: fechado
Identifier DOI: 10.1088/0953-8984/13/2/304
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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