Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-02
Phys. Rev. B 80, 140505(R) (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures. Submitted to Phys. Rev. B Rapid Communications on June 27, 2009
Scientific paper
10.1103/PhysRevB.80.140505
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.
Galanakis Dimitrios
Jarrell Mark
Khatami Ehsan
Macridin Alexandru
Mikelsons Karlis
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