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arXiv:cond-mat/0108446 · Physical review. B, Condensed matter

Charge and spin ordering and charge transport properties in a two-dimensional inhomogeneous t−J model

José A. Riera

Published Jan 22, 2002• 4 citations
arXivHTMLPDF

Abstract

We study a two-dimensional $t\ensuremath{-}J$ model close to the Ising limit in which charge inhomogeneity is stabilized by an on-site potential ${e}_{s},$ by using diagonalization in a restricted Hilbert space and finite temperature quantum Monte Carlo techniques. Both site- and bond-centered stripes are considered and their similitudes and differences are analyzed. The amplitude of charge inhomogeneity is studied as ${e}_{s}\ensuremath{\rightarrow}0.$ Moreover, we show that the antiphase domain ordering occurs at a much lower temperature than the formation of charge inhomogeneities and charge localization. Hole-hole correlations indicate a metallic behavior of the stripes with no signs of hole attraction. Kinetic energies and current susceptibilities are computed and indications of charge localization are discussed. The study of the doping dependence in the range $0.083<~x<~0.167$ suggests that these features are characteristic of the whole underdoped region.

DOI
10.1103/physrevb.65.064524

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Stripes in the extended t−t′t-t^\primet−t′ Hubbard model: A Variational Monte Carlo analysis
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