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VOLUME 25 (1977) | ISSUE 2 | PAGE 95
Superfluidity of Bose condensate of electron-hole pairs
It is shown that the rather weak processes that fix the phase of the wave function of an electron-hole pair (interband transitions in an excitonic dielectric) admit of the existence of metastable spatially inhomogeneous states with nonzero total electron quasimomentum.