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Binding of holons and spinons in the one-dimensional anisotropic t-J model

Jurij Smakov·A. L. Chernyshev·Steven R. White
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Abstract

We study the binding of a holon and a spinon in the one-dimensional anisotropic t-J model using a Bethe-Salpeter equation approach, exact diagonalization, and density matrix renormalization group methods on chains of up to 128 sites. We find that holon-spinon binding changes dramatically as a function of anisotropy parameter α=J_\perp/J_z: it evolves from an exactly deducible impurity-like result in the Ising limit to an exponentially shallow bound state near the isotropic case. A remarkable agreement between the theory and numerical results suggests that such a change is controlled by the corresponding evolution of the spinon energy spectrum.

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Jurij Smakov, A. L. Chernyshev, Steven R. White. 2007-06-29. Binding of holons and spinons in the one-dimensional anisotropic t-J model. https://doi.org/10.1103/physrevlett.98.266401

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