A **composite fermion** is a concept used in condensed matter physics, particularly in the study of the quantum Hall effect and two-dimensional electron systems. The idea is that under certain conditions, such as in a high magnetic field and low temperature, the behavior of electrons can be effectively described as being made up of composite particles rather than individual electrons.
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An emergent description of correlated electrons in which an even number of statistical flux quanta is attached to each electron. The resulting effective field can turn selected fractional electronic fillings into integer effective fillings. Flux attachment encodes correlations; it is not attachment of literal external magnetic solenoids to individual electrons.