Fig. 2: Doping dependence and sign change of S and SKelvin.
From: Quantitative assessment of the universal thermopower in the Hubbard model
Thermopower S (a) and the Kelvin formula for the thermopower SKelvin (b) as a function of doping p for the Hubbard model with different U and \({t}^{{\prime} }\), all at the same temperature kBT = t/3. Inset of (b): density n, measured using DQMC, as a function of the chemical potential μ for U/t = 6, and \({t}^{{\prime} }/t=-0.25\) at different temperatures T. The arrows in (b) and its inset indicate the correspondence between the sign change of SKelvin and the vanishing of the temperature dependence of μ at fixed density.
