Stability of optically-active charged excitons in quasi-two dimensional systems

Details Stability of optically-active charged excitons in quasi-two dimensional systems Stability of optically-active charged excitons in quasi-two dimensional systems

1996-10-24

arxiv.org/abs/cond-mat/9610176v3

Physics

Condensed Matter

Minor revisions, mainly removal of the term trion in favour of the term charged-exciton to comply with Physical Review B. To b

Scientific paper

10.1103/PhysRevB.55.R10221

A negatively charged quasi-two dimensional exciton ($X^-$) is solved exactly numerically in the presence of a uniform perpendicular B-field. Various quasi-two dimensional geometries are studied. The charge distribution of the $X^-$ parallel to the B-field is found to be crucial in determining the stability of the optically-active $X^-$ and hence its photoluminescence (PL) signature. The theory provides a quantitative explanation of recent experimental results obtained for a GaAs quantum well. Effects are found which cannot be described within a lowest Landau level approximation. PACS: 78.20.Ls 78.66.-w 73.20.Dx

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