Two-Dimensional Hubbard Model at Low Electron Density

Hidetoshi Fukuyama, Yasumasa Hasegawa, Osamu Narikiyo

研究成果: Contribution to journalArticle査読

48 被引用数 (Scopus)

抄録

The two dimensional Hubbard model with repulsive interaction is studied in the t-matrix approximation, which is the valid approximation in low electron density. The particle-particle correlation function and the t-matrix are obtained analytically. By use of these analytical results it is shown that the t-matrix and hence the self-energy have no singularities in the upper half plane of the complex energy variable. The phase angle δ(2kF + q, ω), with kF being the Fermi wave vector, in the limit of q=0 and ω = 0 is found to depend strongly on the ratio ω/q and is not always zero. The case of the attractive interaction is also briefly studied.

本文言語英語
ページ(範囲)2013-2030
ページ数18
ジャーナルjournal of the physical society of japan
60
6
DOI
出版ステータス出版済み - 1 1991
外部発表はい

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

フィンガープリント

「Two-Dimensional Hubbard Model at Low Electron Density」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル