Anomalous dispersion of charged excitons in dilute two-dimensional electron systems at low temperatures

Broocks, K.-B. ; Schröter, P. ; Heitmann, Detlef ; Heyn, Ch. ; Schüller, Christian ; Bichler, Max ; Wegscheider, Werner

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Date of publication of this fulltext: 21 Sep 2009 07:16

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Abstract

We report the observation of a strong anomaly in the magnetic-field dispersion of negatively charged excitons in dilute two-dimensional electron systems. The anomaly exists in an intermediate density range around 1×1011 cm–2, and at temperatures T<1 K, only. The strength of the anomaly at T = 0.1 K is about 2.5 meV, and the most striking feature is that it can be completely destroyed by a ...

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