Variational Monte Carlo study of electron differentiation around Mott transition

Daisuke Tahara, Masatoshi Imada

Research output: Contribution to journalArticle

15 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

Fingerprint

electrons
arcs
metals
guy wires
two dimensional models
quantum numbers
Monte Carlo method
projection
wave functions
momentum
optimization
ground state
interactions

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Variational Monte Carlo study of electron differentiation around Mott transition. / Tahara, Daisuke; Imada, Masatoshi.

In: Journal of the Physical Society of Japan, Vol. 77, No. 9, 093703, 01.09.2008.

Research output: Contribution to journalArticle

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