Variational Monte Carlo studies of a t-J model on an anisotropic triangular lattice

Tsutomu Watanabe, Hisatoshi Yokoyama, Yukio Tanaka, Jun Ichiro Inoue, Masao Ogata

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)

Abstract

With the insulating phase of κ-(BEDT-TTF)2X in mind, we study a t-J model on an anisotropic triangular lattice, where the hopping integral is t′ in one of the three directions, using a variational Monte Carlo method. By changing the value of t′/t, we study the stability of superconducting (SC) states with d- and d + id-wave symmetries and of an antiferromagnetic (AF) state. As t′/t decreases from 1, the stable state immediately switches from the d + id wave to the d wave. The AF state is stabilized from the normal spin liquid state for t′/t ≲ 0.7 at half filling. We also take account of Nagaoka ferromagnetism and a phase separation.

Original languageEnglish
Pages (from-to)289-294
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume426-431
Issue numberI
DOIs
Publication statusPublished - 2005 Oct 1
EventProceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity -
Duration: 2004 Nov 232004 Nov 25

Keywords

  • Anisotropic triangular lattice
  • Variational Monte Carlo method
  • d + id wave
  • t-J model

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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