Two-hole and four-hole bound states in a t-J ladder at half-filling

Article

关键词: SUPERCONDUCTING CORRELATIONS;    HEISENBERG ANTIFERROMAGNETS;    2-LEG LADDERS;    SPIN-LIQUID;    J MODEL;    DYNAMICS;    EXPANSIONS;   

DOI  :  10.1103/PhysRevB.66.085112

来源: SCIE

【 摘 要 】

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 behavior as the bound states merge into the continuum. A class of four-hole bound states is also studied, leading to the conclusion that phase separation occurs for t/Jless than or similar to0.5, in agreement with other studies.

【 授权许可】

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