Formation of clusters in the ground state of the t–J model on a two-leg ladder

2004/10/27 by A. Fledderjohann, A. Langari, K-H Mütter +1 · 2 citations
Physics and Astronomy · #Anisotropy #Charge (physics) #Cluster (spacecraft) #Computer science #Condensation #Condensed matter physics #Ground state #Lambda #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Theoretical and Computational Physics #Thermodynamics #cond-mat.str-el

paper · pdf · doi:10.1088/0953-8984/16/47/010

published in Journal of Physics Condensed Matter 16(47), 8571-8588 (IOP Publishing) · 11 pages, 9 figures, RevTex4

arxiv created 2004/10/27 · openalex publication_date 2004/11/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We investigate the ground state properties of the t-J model on a two leg ladder with anisotropic couplings (t,α=J/t) along rungs and (t',α'=J'/t') along legs. We have implemented a cluster approach based on 4-site plaqettes. In the strong asymmetric cases α/α'≪ 1 and α'/α≪ 1 the ground state energy is well described by plaquette clusters with charges Q=2,4. The interaction between the clusters favours the condensation of plaquettes with maximal charge -- a signal for phase separation. The dominance of Q=2 plaquettes explains the emergence of tightly bound hole pairs. We have presented the numerical results of exact diagonalization to support our cluster approach.

Citations

• Possible highT c superconductivity in the Ba?La?Cu?O system
• The phase diagram of an exactly solvablet-Jladder model
• Rung-rung current correlations on a 2-legt−Jladder
• Bosonic model of hole pairs
• Indications of spin-charge separation in the two-dimensionalt-Jmodel
• Phase separation int−Jladders
• Superconducting Gap for a Two-Legt−JLadder
• Bond-operator theory of doped antiferromagnets: From Mott insulators with bond-centered charge order to superconductors with nodal fermions