# Direct observation of a fractional charge

@article{dePicciotto1997DirectOO, title={Direct observation of a fractional charge}, author={R. de-Picciotto and M. Reznikov and Moty Heiblum and Vladimir I. Umansky and Gregory Bunin and Diana Mahalu}, journal={Nature}, year={1997}, volume={389}, pages={162-164} }

Since Millikan's famous oil-drop experiments, it has been well known that electrical charge is quantized in units of the charge of an electron, e. For this reason, the theoretical prediction, by Laughlin of the existence of fractionally charged ‘quasiparticles’—proposed as an explanation for the fractional quantum Hall (FQH) effect—is very counterintuitive. The FQH effect is a phenomenon observed in the conduction properties of a two-dimensional electron gas subjected to a strong perpendicular… Expand

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Observation of quasiparticles with one-fifth of an electron's charge

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The charge of the quasiparticles was measured as they tunneled through a narrow constriction embedded in a fractional quantum Hall (FQH) liquid. The determination of the charge was made via detailed… Expand

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The quantum Hall effect (QHE) is a set of phenomena observed at low temperature in a two-dimensional electron gas subject to a strong perpendicular magnetic field. It manifests itself as a… Expand

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Interference of fractionally charged quasiparticles is expected to lead to Aharonov-Bohm oscillations with periods larger than the flux quantum. However, according to the Byers-Yang theorem,… Expand

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