Energy spectra and photoluminescence of charged magneto-excitons

Abstract

Charged magneto-excitons X- in a dilute 2D electron gas in narrow and symmetric quantum wells are studied using exact diagonalization techniques. An excited triplet X- state with a binding energy of about 1 meV is found. This state and the singlet are the two optically active states observed in photoluminescence (PL). The interaction of X-'s with electrons is shown to have short range, which effectively isolates bound X- states from a dilute e-h plasma. This results in the insensitivity of PL to the filling factor nu. For the "dark" triplet X- ground state, the oscillator strength decreases exponentially as a function of 1/nu which explains why it is not seen in PL.

3 pages, 4 figures, submitted to Physica E

References in corpus (1)

• Two-Dimensional Electron-Hole Systems in a Strong Magnetic Field: Composite Fermion Picture for Multi-Component Plasmas

Cited by in corpus (8)

• Charged exctions in the fractional quantum Hall regime
• Definitive observation of the dark triplet ground state of charged excitons in high magnetic fields
• Energy spectra of fractional quantum Hall systems in the presence of a valence hole
• Photoluminescence from fractional quantum Hall systems: Role of separation between electron and hole layers
• The Hierarchy of Incompressible Fractional Quantum Hall States
• Negatively Charged Excitons and Photoluminescence in Asymmetric Quantum Well
• Fractionally charged magneto-excitons
• Electron-Hole Systems in Narrow Quantum Wells: Excitonic Complexes and Photoluminescence