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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 [Formula presented] at a very low temperature (0.1 K) and an intermediate electron density ([Formula presented]). 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 [Formula presented] can be destroyed by applying a small thermal energy of [Formula presented] that is enough to close the quasihole energy gap. © 2003 The American Physical Society.
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