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29 March 2024
 
  » arxiv » cond-mat/9912352

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Phase separation in t-J ladders
Stefan Rommer ; Steven R. White ; D. J. Scalapino ;
Date 20 Dec 1999
Subject Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con
AffiliationUniversity of California, Irvine), D. J. Scalapino (University of California, Santa Barbara
AbstractThe phase separation boundary of isotropic t-J ladders is analyzed using density matrix renormalization group techniques. The complete boundary to phase separation as a function of J/t and doping is determined for a chain and for ladders with two, three and four legs. Six-chain ladders have been analyzed at low hole doping. We use a direct approach in which the phase separation boundary is determined by measuring the hole density in the part of the system which contains both electrons and holes. In addition we examine the binding energy of multi-hole clusters. An extrapolation in the number of legs suggests that the lowest J/t for phase separation to occur in the two dimensional t-J model is J/t~1.
Source arXiv, cond-mat/9912352
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