Vv. Krivolapchuk et al., A giant shot of radiation intensity as eventual evidence of Bose-Einstein condensation of excitons in double quantum wells in GaBs/AlGaAs, NANOTECHNOL, 11(4), 2000, pp. 246-251
In this paper we present a low-temperature (T < 30 K) photoluminescence (PL
study of space-indirect excitons in GaAs/AlGaAs double quantum wells at pu
mping density P and external electric field V-dc. At certain external param
eter values(P, T and V-dc) part of the spectral profile of the indirect exc
iton (IX) line reveals an enormous increase (shot) of PL intensity (threefo
ld), which fluctuates in time on the characteristic scale of tens of second
s. To explain this anomalous behaviour we use the theoretical model of the
Bose-Einstein condensation effect which takes place in a system of 2D boson
s which, in addition to extended stares, have a discrete energy spectrum be
low the bottom of the free zone.