Energy spectra and photoluminescence of charged magneto-excitons

Details Energy spectra and photoluminescence of charged magneto-excitons Energy spectra and photoluminescence of charged magneto-excitons

2000-01-21

arxiv.org/abs/cond-mat/0001328v1

Physica E, 8, 254 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 4 figures, submitted to Physica E

Scientific paper

10.1016/S1386-9477(00)00153-3

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.

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