Quantum Hall effect
= Quantum Hall effect
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The <quantum Hall effect> connects an electrical measurement to a quantum counting rule: a <two-dimensional electron gas> in a perpendicular <magnetic field> can exhibit plateaus of transverse <electrical resistance>. The integer case supplies a resistance scale built from the <Planck constant> and <elementary charge>, rather than the sample's dimensions. The <fractional quantum Hall effect> involves additional many-<Electron> physics.