= Mott criterion
{c}
{title2=$n_c^{1/3}a_B^*\simeq0.25$}
The approximate donor metal-insulator threshold is often written $n_c^{1/3}a_B^*\simeq0.25$. It estimates when overlap and screening destroy isolated donor <localization>. The numerical coefficient is empirical and not a universal exact result; disorder, compensation and anisotropy can shift the threshold.<The Mott criterion: So simple and yet so complex by Alexander Pergament and others>[Abstract and effective-radius scaling]{ref}
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