Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 6: Optische Eigenschaften

HL 6.9: Vortrag

Freitag, 4. März 2005, 12:45–13:00, TU P-N229

Exciton Diamagnetic Shift Reveals New Features in Disorder Statistics — •Michal Grochol, Frank Grosse, and Roland Zimmermann — Institut für Physik der Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany

As the well-known near-field optical experiment [1] has shown, the diamagnetic shift varies among individual exciton lines in disordered quantum wells. Our calculations based on the full solution of the exciton Schrödinger equation in electron and hole coordinates [2] reveal a correlation between diamagnetic shift and wave function localization. A parallel computer code is developed to handle large scale simulations for different potential types. The diamagnetic shift average value and fluctuations as a function of the exciton transition energy are calculated. The relation between the underlying potential statistics and the diamagnetic shift is analyzed making the diamagnetic shift an experimental tool for investigating the underlying potential landscape.

[1] H. F. Hess, E. Betzig, T. D. Harris, L. N. Pfeiffer, and K. W. West, Science 264, 1740 (1994).

[2] M. Grochol, F. Grosse, and R. Zimmermann, to appear in J. Lumin. (2004).