Variational Monte Carlo Study of Electron Differentiation around Mott Transition(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• 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.

• 社団法人日本物理学会の論文
• 2008-09-15

著者

• Imada Masatoshi

  Department Of Applied Physics University Of Tokyo

• Imada Masatoshi

  Department Of Applied Physics University Of Tokyo:jst Crest

• Tahara Daisuke

  Department Of Physics University Of Tokyo

• Tahara Daisuke

  Department Of Mar. Sci. Fukui Prefectural University

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