Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 7: Quantum dots and wires: Optical properties I

HL 7.6: Vortrag

Montag, 27. März 2006, 11:30–11:45, POT 151

Diamagnetic shift of disorder-localized excitons in narrow quantum wells — •M. Erdmann¹, M. Wenderoth¹, R. G. Ulbrich¹, S. Malzer², and G. Döhler² — ¹Universität Göttingen, IV. Physikalisches Institut, Germany — ²Universität Erlangen-Nürnberg, Institut für technische Physik, Germany

Magneto-µ-photoluminescence (µPL) experiments on narrow GaAs/Al_0.3Ga_0.7As quantum wells reveal an increase in diamagnetic shift of localized exciton states with emission energy. In a narrow GaAs/AlAs double quantum well, even negative diamagnetic shift is observed. µPL spectra were obtained in a confocal setup with a magnetic field applied perpendicular to the quantum well plane. This is the first experimental evidence that the diamagnetic shift of disorder-localized excitons is a sum of two contributions: A positive shift from the relative motion, and a negative center-of-mass shift resulting from disorder. [1]

[1] M. Grochol, F. Grosse, and R. Zimmermann, PRB 71, 125339 (2005)