Photoluminescence signatures of negatively charged magnetoexcitons

The negatively charged quasi-two-dimensional exciton (X-) is studied numerically in the presence of a uniform perpendicular B field and various in-plant confinements, The corresponding photoluminescence (PL) spectra, including shakeup processes, are calculated. These calculations provide a quantitative explanation of recent experimental PL spectra. The photoluminescence signatures of charged excitons in quantum dots are also examined. Electron-hole pair distribution functions are calculated that show the structure of the charged exciton states (both ground and excited stairs). Increasing excitation reflects a competition between two effects: partial ionization of either one or two electrons.