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Exciton Mott physics in two-dimensional electron-hole (e-h) systems isstudied in the quasiequilibrium, which is the crossovers or phase transitionsbetween the insulating exciton gas and the metallic e-h plasma. By developing aself-consistent screened T-matrix approximation, we succeed in obtaining the"global" phase diagram on the plane of the e-h density and the temperature as acontour plot of the exciton ionization ratio. The detailed features of theexciton-Mott crossover at high temperature are figured out beyond theconventionally used concept of the Mott density. At low temperature, we findnot only the region unstable toward the inhomogeneity but the pure Motttransition point characterized by the discontinuity in the ionization ratio.The single particle spectra also exhibit interesting features reflecting theexcitonic correlations.

Exciton-Mott Physics in Two-Dimensional Electron-Hole Systems: Phase Diagram and Single-Particle Spectra