Münster 1999 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 7: Symposium: Koh
ärenzeffekte in der Halbleiterspektroskopie

HL 7.2: Fachvortrag

Montag, 22. März 1999, 16:30–17:00, Ger

Ultrafast spectral interferometry of resonant secondary emission from semiconductor quantum wells — •Dan Birkedal and Jagdeep Shah — Bell-Laboratories, Lucent Technologies, 101 Crawfords Corner Road, Holdel, NJ 07733, USA

Recent investigations of secondary emission from quantum well excitons following ultrafast resonant excitation have demonstrated an intricate interplay of coherent Rayleigh scattering and incoherent luminescence. We have very recently demonstrated that it is possible to isolate and time resolve the coherent field associated with the Rayleigh component using ultrafast spectral interferometry, thus, obtaining substantial and new information of the nature of resonant secondary emission [1]. Our findings demonstrates that Rayleigh scattering from static disorder is inherently a non-ergodic process invalidating the use of current thories using ensemble averages to describe our observations.

[1] D. Birkedal and J. Shah, Phys. Rev. Lett. 81, 2372 (1998)