Variational Monte Carlo study of electron differentiation around Mott transition

Daisuke Tahara*, Masatoshi Imada

*この研究の対応する著者

研究成果: Article査読

19 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号093703
ジャーナルjournal of the physical society of japan
77
9
DOI
出版ステータスPublished - 2008 9
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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