Pseudogap temperature as a Widom line in doped Mott insulators

Abstract

The pseudogap refers to an enigmatic state of matter with unusual physical properties found below a characteristic temperature $T^{\ast }$ in hole-doped high-temperature superconductors. Determining $T^{\ast }$ is critical for understanding this state. Here we study the simplest model of correlated electron systems, the Hubbard model, with cluster dynamical mean-field theory to find out whether the pseudogap can occur solely because of strong coupling physics and short nonlocal correlations. We find that the pseudogap characteristic temperature $T^{\ast }$ is a sharp crossover between different dynamical regimes along a line of thermodynamic anomalies that appears above a first-order phase transition, the Widom line. The Widom line emanating from the critical endpoint of a first-order transition is thus the organizing principle for the pseudogap phase diagram of the cuprates. No additional broken symmetry is necessary to explain the phenomenon. Broken symmetry states appear in the pseudogap and not the other way around.

6 pages, 4 figures and supplementary information; published version

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