期刊
PHYSICAL REVIEW B
卷 80, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.140505
关键词
-
资金
- NSF [DMR-0706379, OISE-0730290]
- U. S. Department of Energy [DE-AC05-00OR22725]
We study the thermodynamics of the two-dimensional Hubbard model within the dynamical cluster approximation. We use continuous time quantum Monte Carlo as a cluster solver to avoid the systematic error which complicates the calculation of the entropy and potential energy (double occupancy). We find that at a critical filling, there is a pronounced peak in the entropy divided by temperature, S/T, and in the normalized double occupancy as a function of doping. At this filling, we find that specific heat divided by temperature, C/T, increases strongly with decreasing temperature and kinetic and potential energies vary like T(2) ln T. These are all characteristics of quantum critical behavior.
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