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arXiv · 1205.0924

Surface acoustic wave controlled charge dynamics in a thin InGaAs quantum well

Florian J. R. Schülein·Jens Pustiowski·Kai Müller·Max Bichler·Gregor Koblmüller·Jonathan J. Finley·Achim Wixforth·Hubert J. Krenner
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Abstract

We experimentally study the optical emission of a thin quantum well and its dynamic modulation by a surface acoustic wave (SAW). We observe a characteristic transition of the modulation from one maximum to two maxima per SAW cycle as the acoustic power is increased which we find in good agreement with numer- ical calculations of the SAW controlled carrier dynamics. At low acoustic powers the carrier mobilites limit electron-hole pair dissociation, whereas at high power levels the induced electric fields give rise to efficient acousto-electric carrier transport. The direct comparison between the experimental data and the numerical simulations provide an absolute calibration of the local SAW phase.

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Florian J. R. Schülein, Jens Pustiowski, Kai Müller, Max Bichler, Gregor Koblmüller, Jonathan J. Finley, Achim Wixforth, Hubert J. Krenner. 2012-05-04. Surface acoustic wave controlled charge dynamics in a thin InGaAs quantum well. https://doi.org/10.1134/s0021364012110082

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