Finite compressibility in the low-doping region of the two-dimensional t-J model

  title={Finite compressibility in the low-doping region of the two-dimensional t-J model},
  author={Massimo Lugas and Leonardo Spanu and Federico Becca and Sandro Sorella},
  journal={Physical Review B},
We reexamine the important issue of charge fluctuations in the two-dimensional $t\text{\ensuremath{-}}J$ model by using an improved variational method based on a wave function that contains both antiferromagnetic and $d$-wave superconducting order parameters. In particular, we generalize the wave function introduced some time ago by Bouchaud, Georges, and Lhuillier [J. Phys. (Paris) 49, 553 (1988)] by considering also a long-range spin-spin Jastrow factor, in order to correctly reproduce the… 
Magnetism and superconductivity in the t − t ′ − J model
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Interhole and interelectron correlations as well as a transition to phase separation in the t-J model near half filling are reconsidered using a variational Monte Carlo method. As a trial wave
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Bond-order-modulated staggered-flux phase of the tJ model on a square lattice
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We investigate the phase diagram of the t-J model on a triangular lattice using a variational Monte Carlo approach. We use an extended set of Gutzwiller projected fermionic trial wave functions
Ground-state correlations of quantum antiferromagnets: A Green-function Monte Carlo study.
A well-known transformation is used to map the spin problem onto a system of hard-core bosons that allows us to exploit interesting analogies between magnetism and superfluidity.
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We develop a general numerical method to study the zero temperature properties of strongly correlated electron models on large lattices. The technique, which resembles Green’s Function Monte Carlo,
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Phases of the t-J model from variational Monte Carlo studies: Occurrence of time-reversal symmetry breaking.
A phase diagram is found in the density-{ital t}/{ital J} plane which has coexistence of antiferromagnetism and superconductivity at very low hole concentrations and super conductivity up to rather high values of density---about 40%.
Phase diagram of the two-dimensional t-J model at low doping.
  • Poilblanc
  • Physics
    Physical review. B, Condensed matter
  • 1995
The phase diagram of the planar t--J model at small hole doping is investigated by finite size scaling of exact diagonalisation data of NXN clusters (up to 26). Hole-droplet binding energies,
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