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

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

2007-02-08

arxiv.org/abs/cond-mat/0702213v2

Phys. Rev. Lett. 98, 266401 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, published version

Scientific paper

10.1103/PhysRevLett.98.266401

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 \alpha=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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