Spin and charge structure factor of the two-dimensional Hubbard model

Walter Zimmermann, Raymond Frésard, and Peter Wölfle
Phys. Rev. B 56, 10097 – Published 15 October 1997
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Abstract

The spin and charge structure factors are calculated for the Hubbard model on the square lattice near half filling using a spin-rotation invariant six-slave boson representation. The charge structure factor shows a broad maximum at the zone corner and is found to decrease monotonically with increasing interaction strength and electron density and increasing temperature. The spin structure factor develops with increasing interaction two incommensurate peaks at the zone boundary and along the zone diagonal. Comparison with results of quantum Monte Carlo and variational calculations is carried out and the agreement is found to be good. The limitations of a random-phase-approximation type approach are pointed out.

  • Received 22 April 1997

DOI:https://doi.org/10.1103/PhysRevB.56.10097

©1997 American Physical Society

Authors & Affiliations

Walter Zimmermann

  • Institut für Theorie der Kondensierten Materie, Physikhochhaus, Postfach 6980, Universität Karlsruhe, D-76128 Karlsruhe, Federal Republic of Germany

Raymond Frésard

  • Department of Physics, Shimane University, Nishikawatsu-cho 1060, Matsue 690, Shimane, Japan

Peter Wölfle

  • Institut für Theorie der Kondensierten Materie, Physikhochhaus, Postfach 6980, Universität Karlsruhe, D-76128 Karlsruhe, Federal Republic of Germany

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Vol. 56, Iss. 16 — 15 October 1997

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