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VOLUME 46 (1987) | ISSUE 2 | PAGE 81
Zeros in the fermion spectrum in superfluid systems as diabolical points
The gap in the energy spectrum of fermion excitations in superfluid Fermi systems may vanish at points or lines on the Fermi surface. The only zeros that are stable with respect to external excitations, however, are those which are diabolical points (or lines) of the spectrum and which therefore have a topological charge.