# Is Fractional quantum Hall effect proof that leptons are composite particles?

The fractional quantum Hall effect (FQHE) is a physical phenomenon in which the Hall conductance of 2D electrons shows precisely quantised plateaus at fractional values. Should this be considered evidence that electrons are composite?

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one may explicitly write down a wave function involving electrons, particles with charge $-|e|$, that reproduces all the fractional observations. He got a Nobel prize for this wave function in 1998.
For electrons, including those in the fractional quantum Hall effect, one may experimentally show that the short-distance particles (revealed by high-energy collisions) are electrons of charge $-|e|$. For hadrons, one may repeat the same experiments and see that the short-distance, fundamental particles are quarks with charges such as $+2|e|/3$ or $-|e|/3$. So the situations are fundamentally different even though each particle, regardless of the charge, may create various bound states and manifest itself in ways that "look like" a different charge at longer distances.