The Fermi Glass: Theory and Experiment

I left localization in 1958–9 for superconductivity, not because I had any doubts about the result, since the paper was practically a proof and Feher's ENDOR method couldn't work without it, but because I was bemused by the strong interactions between real electrons. Mott deserves all the credit for nursing my dream into the real world, and here is the first evidence that even I had become a believer. I saw at last that Mott and Anderson insulators were complementary and indispensible to each other. That is, repulsive interactions will necessarily make even fewer final states available for coherent hopping processes at the Fermi level than are available for non-interacting electrons. Elihu Abrahams and Nevill Mott had, between them, built a whole transport theory on my ideas, which Mott proceeded to correlate with experiments. This paper marks the prodigal's return to the subject…