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VOLUME 47 (1988) | ISSUE 12 | PAGE 628
Superconductivity as a consequence of an anomalous nonlinear polarizability of electrons with an extremum surface in the dispersion law
For a semiconductor which has a surface or line (or loop) of extrema there exists an interval of doping levels in which the correlation energy exceeds the kinetic energy, even in the case of a weak interaction. In this case, superconductivity would arise as the result of an electron-electron attraction stemming from the quadratic nonlinear polarizability of the same electrons.