Broocks, K.-B. and Schröter, P. and Heitmann, Detlef and Heyn, Ch. and Schüller, Christian and Bichler, Max and Wegscheider, Werner (2002) Anomalous dispersion of charged excitons in dilute two-dimensional electron systems at low temperatures. Physical Review B (PRB) 66; 4 , 041309.
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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 thermal energy of about 0.2 meV (2 K). Furthermore, the anomaly is observed both in photoluminescence and direct absorption measurements, which gives a strong indication that it is of intrinsic origin.
|Date:||29 July 2002|
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller|
|Keywords:||excitons, two-dimensional electron gas, quantum Hall effect, photoluminescence, absorption|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||21 Sep 2009 07:16|
|Last Modified:||20 Jul 2011 21:44|