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VOLUME 57 (1993) | ISSUE 5 | PAGE 277
Stratification of a coherent state of excitons sustained by optical pumping
An instability of a coherent state of Wannier-Mott excitons sustained by a resonant pump wave is analyzed. The instability involves a spatially periodic stratification with a period L~Lex= (¥i/my)xn, where m is the effective exciton mass, and γ is the reciprocal exciton lifetime.