Fractional Quasiexcitons in Photoluminescence of Quantum Hall Liquids

Realistic calculations of photoluminescence spectra for a 20 nm quan-tum well at a filling factor ν = 1/3 are presented. The new states formed from charged excitons (trions) by correlation with the surrounding electrons are identified. These “quasiexcitons ” differ from usual excitons and trions by having fractionally charged constituents. Their binding energies and emis-sion intensities depend on the involved trion, leading to discontinuity in photoluminescence. PACS numbers: 71.35.Pq, 71.35.Ji, 73.43.–f, 71.10.Pm 1