Drude weight of the two-dimensional Hubbard model - Reexamination of finite-size effect in exact diagonalization study

Hiroki Nakano, Yoshinori Takahashi, Masatoshi Imada

研究成果: Article

7 引用 (Scopus)

抄録

The Drude weight of the Hubbard model on the two-dimensional square lattice is studied by the exact diagonalizations applied to clusters up to 20 sites. We carefully examine finite-size effects by consideration of the appropriate shapes of clusters and the appropriate boundary condition beyond the limitation of employing only the simple periodic boundary condition. We successfully capture the behavior of the Drude weight that is proportional to the squared hole doping concentration. Our present result gives a consistent understanding of the transition between the Mott insulator and doped metals. We also find, in the frequency dependence of the optical conductivity, that the mid-gap incoherent part emerges more quickly than the coherent part and rather insensitive to the doping concentration in accordance with the scaling of the Drude weight.

元の言語English
記事番号034705
ジャーナルJournal of the Physical Society of Japan
76
発行部数3
DOI
出版物ステータスPublished - 2007 3 1
外部発表Yes

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two dimensional models
boundary conditions
insulators
scaling
conductivity
metals

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

Drude weight of the two-dimensional Hubbard model - Reexamination of finite-size effect in exact diagonalization study. / Nakano, Hiroki; Takahashi, Yoshinori; Imada, Masatoshi.

:: Journal of the Physical Society of Japan, 巻 76, 番号 3, 034705, 01.03.2007.

研究成果: Article

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