THE SYMMETRY OF THE MOMENTUM DISTRIBUTION-FUNCTIONS IN THE HUBBARD-MODEL AT HALF-FILLING

In this article, by exploiting the unitary partial particle-hole transformations between the positive-U and negative-U Hubbard models at half-filling, we shall rigorously show that the momentum distribution functions of these models possess some symmetry, which was originally realized only for the ideal tight-binding electron models on a d-dimensional simple cubic lattice.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1994PK69100020&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, Condensed MatterSCI(E)EI1ARTICLE3277-2809