Two-Hole and Four-Hole Bound States in a t-J Ladder at half-filling

Abstract

The two-hole excitation spectrum of the t-J ladder at half-filling is studied using linked-cluster series expansion methods. A rich spectrum of bound states emerges, particularly at small $t/J$. Their dispersion relations and coherence lengths are computed, along with the threshold behaviour as the bound states merge into the continuum. A class of 4-hole bound states is also studied, leading to the conclusion that phase separation occurs for $t/J\lesssim 0.5$, in agreement with other studies.

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References in corpus (1)

• Single hole dynamics in the t-J model on two- and three-leg ladders

Cited by in corpus (3)

• Resonant magnetic mode in superconducting 2-leg ladders
• The Gap Function Phi(k,w) for a Two-leg t-J Ladder and the Pairing Interaction
• The t-Jz ladder