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

Smakov, Jurij; Chernyshev, A. L.; White, Steven R.

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

Authors

Smakov, Jurij

Chernyshev, A. L.

White, Steven R.

Description

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.
4 pages, 5 figures, published version