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HL: Halbleiterphysik

HL 7: Symposium: Koh
ärenzeffekte in der Halbleiterspektroskopie

HL 7.4: Fachvortrag

Montag, 22. März 1999, 17:30–18:00, Ger

Time- and phase-resolved resonant Rayleigh scattering probes the excitonic polarization in a 2D disorder potential — •Stefan Haacke¹, Vincenzo Savona², Samuel Schaer¹, and Benoît Deveaud¹ — ¹Ecole Polytechnique de Lausanne, DP-IMO, CH-1015 Lausanne, Schweiz — ²Ecole Polytechnique de Lausanne, DP-IPT, CH-1

We present experimental results of time-

and phase-resolved secondary emission from

high quality GaAs quantum wells under resonant

excitation of the heavy-hole excitons with 100 fs pulses.

Resonant Rayleigh scattering dominates the initial

part of the emission at low temperatures and

excitation densities. A single speckle of this temporally

coherent component has been analyzed by spectral

interferometry in a Mach-Zehnder scheme.

We will discuss in detail the relation between the

excitonic localization due to interface disorder and

the temporal and spectral shape of the excitonic polarization.