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Drift mobility of long-living excitons in coupled GaAs quantum wells

A. Gartner·A. W. Holleitner·D. Schuh·J. P. Kotthaus
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Abstract

We observe high-mobility transport of indirect excitons in coupled GaAs quantum wells. A voltage-tunable in-plane potential gradient is defined for excitons by exploiting the quantum confined Stark effect in combination with a lithographically designed resistive top gate. Excitonic photoluminescence resolved in space, energy, and time provides insight into the in-plane drift dynamics. Across several hundreds of microns an excitonic mobility of >10^5 cm2/eVs is observed for temperatures below 10 K. With increasing temperature the excitonic mobility decreases due to exciton-phonon scattering.

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A. Gartner, A. W. Holleitner, D. Schuh, J. P. Kotthaus. 2006-02-25. Drift mobility of long-living excitons in coupled GaAs quantum wells. https://doi.org/10.1063/1.2267263

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