Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 71: Transport Properties

HL 71.1: Talk

Thursday, March 23, 2017, 09:30–09:45, POT 112

Indirect excitons in (111) GaAs double quantum wells — •Colin Hubert, Alberto Hernández-Mínguez, Klaus Biermann, and Paulo Santos — Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany

We study the dynamics of indirect (or dipolar) excitons (IXs) in GaAs (111) double quantum wells (DQWs) subjected to a transverse electric field. In comparison with single (111) QWs, these DQWs can store, for a comparable applied fields and optical excitation density, a density of IXs much larger than in SQWs, thus leading to stronger IX-IX repulsive interactions. We show by means of spatially-resolved optical spectroscopy that IXs in (111) DWQs can be transported over distances exceeding 60 micrometers. From the spectral dependence of the IX spatial distribution profiles, we show that the long transport distances are due to drift forces arising from the strong IX-IX interactions.