This chapter presents phenomenological scaling theory of quantum metal-insulator transition of non-interacting electrons. It confirms the existence of the transition in 3D-system; and elucidates the relation between the correlation length and the conductance, the shape of the critical region, and the temperature dependence of the conductance inside it (T1/3-law). For 2D-systems, it predicts that there is no transition, only a weak-to-strong localization crossover.
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