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VOLUME 58 (1993) | ISSUE 10 | PAGE 809
Anomalously narrow Coulomb gap
Many-electron correlations are likely in the hopping motion of localized charge carriers when the impurity band is approximately half-filled. These correlations should make the Coulomb gap narrower than in the Efros-Shklovsku one-electron limit. A narrowing of this sort, by about an order of magnitude, has been observed experimentally in a "K=0.3" lot of samples of neutron-transmutation-doped Ge:Ga.