Optical probing of a fractionally charged quasihole in an incompressible liquid

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 x 10(11) cm(-2)). The anomaly is explained as due to perturbati...

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Bibliographic Details
Published in:Physical review letters 2003-09, Vol.91 (11), p.116403-116403, Article 116403
Main Authors: Schüller, C, Broocks, K-B, Schröter, P, Heyn, Ch, Heitmann, D, Bichler, M, Wegscheider, W, Chakraborty, Tapash, Apalkov, V M
Format: Article
Language:English
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Summary: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 x 10(11) 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 exciton which creates a fractionally charged quasihole in the liquid. The anomaly of approximately 2 meV can be destroyed by applying a small thermal energy of approximately 0.2 meV that is enough to close the quasihole energy gap.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.91.116403