Abstract
We study the simplified Hubbard (SH) model in the presence of atransverse field in the infinite-dimension limit. The relevantone-particle Green's functions of the model are obtained by means of aperturbative treatment of the hopping and of the transverse fieldaround the atomic limit. We consider an analytical solution for theimpurity problem. It is shown that this solution is very accuratein describing the spectral properties of the heavy particles of theSH model for intermediate and strong values of the on-site Coulombinteraction U. We find that for large values of U aninsulator-metal transition takes place as a function of thetransverse field. We analyse the metallic phase through thebehaviour of the density of states and those of the optical conductivityand static resistivity. Our results for the latter quantity agreewith what is observed in experiments on Bi2Sr2CuOy.
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