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Pseudogap and magnetic incommensurability in the Hubbard model

A. SHERMAN1,* , M. SCHREIBER2

Affiliation

  1. Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
  2. Institut für Physik, Technische Universität, 09107 Chemnitz, Germany

Abstract

The electron energy spectrum and the magnetic susceptibility of the two-dimensional repulsive Hubbard model are investigated using the diagram technique for the case of strong correlations. In this technique a power series in the hopping constant is used. Obtained results reproduce adequately available data of Monte Carlo simulations. With departure from half-filling x our calculated spectrum demonstrates a pseudogap near the Fermi level and an excitation band with the properties of the spin-polaron band of the t-J model. The low-frequency magnetic susceptibility becomes incommensurate and the incommensurability parameter grows with x. The value of the incommensurability parameter, its dependence on the transfer frequency and on x resemble experimental results in lanthanum cuprates..

Keywords

Hubbard model, Energy spectrum, Pseudogap, Magnetic susceptibility, Magnetic incommensurability.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

A. SHERMAN, M. SCHREIBER, Pseudogap and magnetic incommensurability in the Hubbard model, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1700-1703 (2008)