Exciton formation in strongly correlated electron-hole systems near the semimetal-semiconductor transition

17th International Conference on Recent Progress in Many-Body Theories

Zenker, B.^1 ; Ihle, D.^2 ; Bronold, F.X.^1 ; Fehske, H.^1

Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, D-17489 Greifswald, Germany^1

Institut für Theoretische Physik, Universität Leipzig, D-04109 Leipzig, Germany^2

关键词: Density of electrons;    Electron-hole correlation;    Electrons and holes;    Excitonic insulator;    Qualitative differences;    Semiconductor transition;    Strong-coupling regime;    Strongly correlated electrons;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/529/1/012030/pdf
DOI  :  10.1088/1742-6596/529/1/012030

来源: IOP

【 摘 要 】

The region surrounding the excitonic insulator phase is a three-component plasma composed of electrons, holes, and excitons. Due to the extended nature of the excitons, their presence influences the surrounding electrons and holes. We analyze this correlation. To this end, we calculate the density of bound electrons, the density of electrons in the correlated state, the momentum-resolved exciton density, and the momentum-resolved density of electron-hole pairs that are correlated but unbound. We find qualitative differences in the electron-hole correlations between the weak-coupling and the strong-coupling regime.