Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-09-06
Phys. Rev. B 74, 115332 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 11 figures
Scientific paper
10.1103/PhysRevB.74.115332
Density of states (DOS) and absorption spectrum of weakly doped, narrow quantum wells in high magnetic fields are calculated by realistic exact diagonalization. The systems containing an electron--hole pair with and without an additional, second electron are compared. In DOS, the exciton--electron interaction is shown to fill the gaps between Landau levels and to yield additional discrete peaks corresponding to bound trion states. In absorption, interaction with the additional free electron causes no shift or renormalization of main, excitonic peaks. However, it results in additional, weaker peaks associated with bound trions in the lowest or higher Landau levels. The calculation is supplemented with experimental photoluminescence and photoluminescence-excitation studies of two-dimensional holes and electrons in high magnetic fields.
Bryja Leszek
Gladysiewicz Anna
Potemski Marek
Wojs Arkadiusz
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