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How to probe a fractionally charged quasihole?

Schüller, Christian ; Brooks, K.-B. ; Schröter, P. ; Heyn, Ch. ; Heitmann, Detlef ; Apalkov, V. M. ; Chakraborty, Tapash ; Bichler, Max ; Wegscheider, Werner


We report an anomalous dispersion of charged excitons in photoluminescence experiments on a two-dimensional electron gas subjected to a quantizing magnetic field around Image . We have found that the anomaly exists only at a very low temperature (0.1 K) and an intermediate electron density (0.9×1011 cm−2). It is explained to occur due to the perturbation of the incompressible liquid at Image . ...


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