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Identify the mechanism limiting the quantization temperature (magnetic disorder and gap inhomogeneity, antisite defects, surface-gap fluctuations, parallel bulk conduction) and predict how to raise it. An answer quantitatively links measured disorder to the transport activation gap.","problem_ref":"8cf0de8f17c29b59dddd7826370dac399f75cd9e04c5813d16dfd0b6ef948ed3","references":"","settled_by":"Local imaging of the exchange gap correlated with transport activation energies across samples, reproducing the quantization temperature.","status_note":"","title":"Why zero-field quantized Hall effects survive only near one 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