Quantum phase transitions in the Hubbard model on the planar pyrochlore lattice

Akihisa Koga, Takuya Yoshioka, Norio Kawakami, Hisatoshi Yokoyama

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We investigate electron correlations in the two-dimensional Hubbard model on the planar pyrochlore lattice. By means of variational Monte Carlo simulations, we discuss how stable the paramagnetic semi-metallic state is at half-filling. It is found that the increase of the Coulomb interaction induces the first-order transition around U / t ∼ 9, where the magnetically ordered state is more stable than the Mott insulating phase without symmetry breaking.

本文言語English
ページ(範囲)867-869
ページ数3
ジャーナルJournal of Magnetism and Magnetic Materials
310
2 SUPPL. PART 1
DOI
出版ステータスPublished - 2007 3月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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