- 著者
-
Otsuka Y.
Morita Y.
Hatsugai Y.
- 出版者
- American Physical Society
- 雑誌
- Physical review B (ISSN:01631829)
- 巻号頁・発行日
- vol.66, no.7, pp.073109, 2002-08
- 被引用文献数
-
7
We investigate anisotropic charge fluctuations in the two-dimensional Hubbard model at half-filling. By the quantum Monte Carlo method, we calculate a momentum-resolved charge compressibility κ(k)=d〈n(k)〉/dμ, which shows the effects of an infinitesimal doping. At the temperature T∼t2/U, κ(k) shows a peak structure at the (±π/2,±π/2) points along the