Variational Monte Carlo study of electron differentiation around Mott transition

Daisuke Tahara, Masatoshi Imada

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We study ground-state properties of the two-dimensional Hubbard model at half filling by improving variational Monte Carlo method and by implementing quantum-number projection and multi-variable optimization. The improved variational wave function enables a highly accurate description of the Mott transition and strong fluctuations in metals. We clarify how anomalous metals appear near the first-order Mott transition. The double occupancy stays nearly constant as a function of the on-site Coulomb interaction in the metallic phase near the Mott transition in agreement with the previous unbiased results. This unconventional metal at half filling is stabilized by a formation of "electron-like pockets" coexisting with an arc structure, which leads to a prominent differentiation of electrons in momentum space. An abrupt collapse of the "pocket" and "arc" drives the first-order Mott transition.

Original languageEnglish
Article number093703
Journaljournal of the physical society of japan
Volume77
Issue number9
DOIs
Publication statusPublished - 2008 Sep 1
Externally publishedYes

Keywords

  • Fermi arc
  • Hubbard model
  • Mott transition
  • Strongly correlated electron systems
  • Variational Monte Carlo method

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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