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

DOI zum Zitieren dieses Dokuments:: 10.5283/epub.11310

Broocks, Kay-Birger ; Schröter, Patrick ; Heitmann, Detlef ; Heyn, Christian ; Schüller, Christian ; Bichler, Max ; Wegscheider, Werner

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Veröffentlichungsdatum dieses Volltextes: 07 Dez 2009 13:17

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Zusammenfassung

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 small ...