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Journal Article

Diamagnetic shift of disorder-localized excitons in narrow GaAs ∕ AlGaAs quantum wells


Ropers,  Claus       
Department of Ultrafast Dynamics, MPI for Biophysical Chemistry, Max Planck Society;

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Erdmann, M., Ropers, C., Wenderoth, M., Ulbrich, R. G., Malzer, S., & Döhler, G. H. (2006). Diamagnetic shift of disorder-localized excitons in narrow GaAs ∕ AlGaAs quantum wells. Physical Review B, 74: 125412. doi:10.1103/PhysRevB.74.125412.

Cite as: https://hdl.handle.net/21.11116/0000-000B-6316-D
A correlation between the diamagnetic shift and transition energy of disorder-localized excitons is observed in magnetomicrophotoluminescence (μPL) on narrow GaAs∕Al0.3Ga0.7As quantum wells (QW’s). The QW’s were grown by molecular-beam epitaxy without growth interruption at the interfaces. μPL spectra were obtained in a confocal setup with the magnetic field applied normal to the QW plane. The lowest-energy exciton states have the smallest diamagnetic coefficients; the exciton diamagnetic shift in the localized exciton tail of the QW emission spectra increases by a factor of 2 as a function of transition energy. The positive correlation between diamagnetic shift and emission energy reveals exciton localization by short-range correlated interface disorder.