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

Akihisa Koga, Takuya Yoshioka, Norio Kawakami, Hisatoshi Yokoyama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)867-869
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 1
DOIs
Publication statusPublished - 2007 Mar

Keywords

  • Hubbard model
  • Planar pyrochlore
  • Variational Monte Carlo simulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Quantum phase transitions in the Hubbard model on the planar pyrochlore lattice'. Together they form a unique fingerprint.

Cite this