Phase Diagram and Pairing Symmetry of the Two-Dimensional t- J Model by a Variation Theory

Hisatoshi Yokoyama, Masao Ogata

Research output: Contribution to journalArticlepeer-review

142 Citations (Scopus)

Abstract

Two-dimensional t- J model is studied by a variational Monte Carlo method, using Gutzwiller-Jastrow-type wave functions. Various kinds of superconducting pairing symmetries are compared in order to determine the phase diagram of the ground state in the full J/t-n plane. Near the half filling where the high temperature superconductivity is expected, the dx2-y2-wave pairing state is always the most stable among various symmetries. The three-site term hardly changes the phase diagram in this regime. In the low electron density, the extended s-type wave becomes a quantitatively good state for large J/t although the energy gain is small. The Gutzwiller wave function is shown to be the exact ground state in the low-electron-density limit for the supersymmetric case (J/t = 2).

Original languageEnglish
Pages (from-to)3615-3629
Number of pages15
Journaljournal of the physical society of japan
Volume65
Issue number11
DOIs
Publication statusPublished - 1996

Keywords

  • Gutzwiller approximation
  • Gutzwiller wave function
  • High temperature superconductivity
  • Monte Carlo method
  • Pairing symmetry
  • Phase diagram
  • T- J model
  • Three-site term
  • Variation theory

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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