Zeitschrift für Physik B Condensed Matter

, Volume 76, Issue 4, pp 473–482 | Cite as

On the spectral function of a hole in a one-dimensional quantum antiferromagnet

  • W. Brenig
  • K. W. Becker
Article

Abstract

We discuss the spectral function of a single hole moving in a one-dimensional quantum antiferromagnet. The latter is described by an anisotropic version of thet-J model, wheret is the hopping matrix element. We introduce two independent coupling parametersJ andJ for the Ising and the transverse part of the Heisenberg exchange. Strong electronic correlations which are incorporated in the model prevent the use of usual diagrammatic techniques for dynamic Green functions based on Wick's theorem. For that reason a new projection technique for general correlation functions in terms of cumulants is used. We consider the case of max
. For the case of small transverse coupling relative to the Ising part, we give exact expressions for the one hole correlation function. In the limit of vanishing spin fluctuations our result reduces to earlier calculations of the motion of a hole in a one-dimensional Néel state. However, the inclusion of the spin fluctuations leads to drastic modifications of the spectral function.

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • W. Brenig
    • 1
  • K. W. Becker
    • 1
  1. 1.Max-Planck-Institut für FestkörperforschungStuttgart 80Germany

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