2014/07/04 by Kenichi Asano, Takuya Yoshioka · 1 citation
Physics and Astronomy · #Condensed matter physics #Electron #Exciton #Hubbard model #Ion #Ionization #Mott transition #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor Quantum Structures and Devices #Superconductivity #cond-mat.mes-hall #cond-mat.quant-gas
paper · pdf · doi:10.7566/jpsj.83.084702
published as J. Phys. Soc. Jpn., Vol.83, 084702 (2014) · 11 pages, 6 figures
openalex publication_date 2014/07/04 · arxiv created 2014/07/07 · arxiv updated 2014/07/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Exciton Mott physics in two-dimensional electron-hole (e-h) systems is studied in the quasiequilibrium, which is the crossovers or phase transitions between the insulating exciton gas and the metallic e-h plasma. By developing a self-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 a contour plot of the exciton ionization ratio. The detailed features of the exciton-Mott crossover at high temperature are figured out beyond the conventionally used concept of the Mott density. At low temperature, we find not only the region unstable toward the inhomogeneity but the pure Mott transition point characterized by the discontinuity in the ionization ratio. The single particle spectra also exhibit interesting features reflecting the excitonic correlations.