J. Phys. Soc. Jpn. 59, pp. 1357-1365 (1990) [9 Pages]

Thermodynamic Quantities of the One-Dimensional Hubbard Model at Finite Temperatures

+ Affiliations
1Department of Applied Physics, Osaka University, Suita, Osaka 5652Research Institute for Fundamental Physics, Kyoto University, Kyoto 606

The thermodynamic quantities of the 1D Hubbard model are investigated exactly by means of the Bethe Ansatz solution at finite temperatures. For an arbitrary electron concentration, the magnetic susceptibility, the charge susceptibility and the specific heat are calculated numerically as a function of temperature. On the basis of the obtained results, the characteristic behavior, which appears in the charge excitation near half-filling, is discussed, and is understood to be closely related to the gap formation of the Mott-type insulator.

©1990 The Physical Society of Japan