Dresden 2003 – scientific programme

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HL: Halbleiterphysik

HL 56: Optische Eigenschaften

HL 56.2: Talk

Friday, March 28, 2003, 12:00–12:15, POT/81

Speckles as a probe of exciton acceleration in a quantum well with energy slope — •Gianandrea Mannarini¹, Wolfgang Langbein², and Roland Zimmermann¹ — ¹Institut für Physik der Humboldt-Universität zu Berlin, Hausvogteiplatz 5-7, 10117 Berlin — ²Experimentelle Physik IIb, Universität Dortmund, Otto-Hahn-Str. 4, 44221 Dortmund

The coherent emission from a single quantum well with interface disorder exhibits fluctuations both in detection direction and time elapsed after excitation, called speckles [1]. Applying a uniaxial stress gradient in the quantum well plane, the resonance energy acquires a slope and the speckle pattern gets tilted. A comparison with numerical simulations allows us to conclude on the interplay between exciton localization in the disordered potential landscape and its motion towards lower energy. [1] W.Langbein, J.M.Hvam and R.Zimmermann, Phys. Rev. Lett. 82, 1040 (1999).