Abstract
A study is reported of the low temperature $(Tl30 \mathrm{K})$ photoluminescence from space-indirect excitons (IX) in $\mathrm{GaAs}/{\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ double quantum wells at pumping density P and external electric field ${V}_{\mathrm{dc}}.$ At certain values of the external parameters $(P, T,$ and ${V}_{\mathrm{dc}})$ a part of the spectral profile of the IX line shows an enormous increase (shot) in photoluminescence intensity (three times), fluctuating with time on a characteristic scale of tens of seconds. This anomalous behavior is explained in terms of the theoretical model of the Bose-Einstein condensation occurring in a system of two-dimensional bosons that has, in addition to the extended (free) states, some discrete energy spectrum below the bottom of the free zone.
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