Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 12: Poster I

HL 12.14: Poster

Montag, 8. März 2004, 16:30–19:00, Poster A

Diamagnetic Shift and Localization of Excitons in Disordered Quantum Wells — •Michal Grochol, Frank Grosse, and Roland Zimmermann — Institut für Physik der Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany

Recent nearfield photoluminescence experiments of excitons in quantum wells (QWs) [1] have shown that the diamagnetic shift varies among individual exciton lines. We present calculations for exciton states in QWs with alloy and interface disorder under the influence of a perpendicular magnetic field. Since a separation of the centre-of-mass motion would lead to a fixed diamagnetic shift for all states, we solve the full Schrödinger equation for the electron and hole in-plane coordinates [2]. We compare several numerical treatments like the Leapfrog method and the Lanczos method. The state-dependent diamagnetic shift gives additional information about exciton localization and can explain experimental data.

[1] C. Ropers, Diploma thesis, Univ. Göttingen, 2003.

[2] R. Zimmermann, F. Grosse, and E. Runge, Pure and Applied Chemistry, 69 1179 (1997).