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

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

2002-04-24

arxiv.org/abs/cond-mat/0204514v1

Physics

Condensed Matter

Strongly Correlated Electrons

revtex 4

Scientific paper

10.1103/PhysRevB.66.085112

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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