Variational ground state of a two-orbital Hubbard model

Kenji Kobayashi, Hisatoshi Yokoyama

研究成果: Article査読

7 被引用数 (Scopus)

抄録

An optimization variational Monte Carlo method is formulated for a two-dimensional Hubbard model with doubly degenerate atomic orbitals. We use generalized Gutzwiller-type wave functions, which include all the possible intra-atomic correlations. As a demonstration, we show results of energy and some correlation functions for a special case; at a quarter filling and for large Coulomb interactions, a ferromagnetic state with an orbital order overcomes paramagnetic and superconducting states. However, this ferromagnetism is destabilized by electron doping or by introducing a diagonal transfer in one direction, both of which work as substantial frustrations.

本文言語English
ページ(範囲)1384-1387
ページ数4
ジャーナルJournal of Physics and Chemistry of Solids
66
8-9
DOI
出版ステータスPublished - 2005 8

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学

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