Thermodynamics of the planar Hubbard model

Abstract

The thermodynamic properties: specific heat, entropy, spin susceptibility ${\chi }_s$ and charge susceptibility ${\chi }_c$ are studied as a function of temperature and doping within the two-dimensional Hubbard model with various $U/t=4-12$. Quantities are calculated using the finite-temperature Lanczos method with additional phase-averaging for a system of $4\times 4$ sites. Results show that the entropy at low $T$ reaches a maximum near half-filling at the electron density $n\sim 1\pm 0.15$ in the whole regime of studied $U/t$. The pseudogap in ${\chi }_s(T)$ becomes clearly pronounced for $U/t\ge 8$ while ${\chi }_c$ shows a maximum close to half-filling. The relation of results to those within the t-J model and to experiments is discussed.

4 pages, 4 figures

References in corpus (1)

• Local Dynamics and Strong Correlation Physics I: 1D and 2D Half-filled Hubbard Models

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