KOSTERLITZ-THOULESS TRANSITION AND SHORT-RANGE SPATIAL CORRELATIONS IN AN EXTENDED HUBBARD-MODEL

We study the competition between intersite and local correlations in a spinless two-band extended Hubbard model by taking an alternative lim it of infinite dimensions. We find that the intersite density fluctuat ions suppress the charge Kondo energy scale and lead to a Fermi liquid to non-Fermi-liquid transition for repulsive on-site density-density interactions. In the absence of intersite interactions, this transitio n reduces to the known Kosterlitz-Thouless transition. We show that a new line of non-Fermi liquid fixed points replace those of the zero in tersite interaction problem.