Dynamical-quantum-cluster approach to two-particle correlation functions in the Hubbard model

S. Hochkeppel, F. F. Assaad, and W. Hanke
Phys. Rev. B 77, 205103 – Published 13 May 2008

Abstract

We investigate the charge- and spin-dynamical structure factors for the two-dimensional one-band Hubbard model in the strong coupling regime within the dynamical cluster approximation (DCA) that is explicitly extended to two-particle response functions. The full irreducible two-particle vertex with three momenta and frequencies is approximated by an effective vertex dependent on the momentum and frequency of the spin and/or charge excitation. In the spirit of the DCA, the effective vertex is calculated by using the quantum Monte Carlo methods on a finite cluster. On the basis of a comparison to high temperature auxiliary field quantum Monte Carlo data, we show that near and beyond optimal doping, our results provide a consistent overall picture of the interplay between charge, spin, and single-particle excitations.

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  • Received 28 January 2008

DOI:https://doi.org/10.1103/PhysRevB.77.205103

©2008 American Physical Society

Authors & Affiliations

S. Hochkeppel1, F. F. Assaad1, and W. Hanke1,2

  • 1Institute for Theoretical Physics, University of Würzburg, 97074 Würzburg, Germany
  • 2Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA

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Issue

Vol. 77, Iss. 20 — 15 May 2008

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