## 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 d_{x2-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 language | English |
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Pages (from-to) | 3615-3629 |

Number of pages | 15 |

Journal | journal of the physical society of japan |

Volume | 65 |

Issue number | 11 |

DOIs | |

Publication status | Published - 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)