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Acoustic plasmons and indirect intersubband excitations in tunneling-coupled GaAs-AlxGa1ÀxAs double quantum wells

Bootsmann, M.-T. ; Hu, C. M. ; Heyn, Ch. ; Heitmann, Detlef ; Schüller, Christian
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Date of publication of this fulltext: 21 Sep 2009 07:14


Abstract

In photoluminescence spectroscopy of a low-mobility two-dimensional electron gas subjected to a quantizing magnetic field, we observe an anomaly around nu= (1/3) at a very low temperature (0.1 K) and an intermediate electron density (0.9×1011 cm–2). The anomaly is explained as due to perturbation of the incompressible liquid at the Laughlin state due to close proximity of a localized charged ...

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