Controlling spatially indirect exciton condensate in coupled quantum wells by external fields and phonon laser

A new method for controlling and optical observing spatially and momentum space indirect exciton condensate in coupled quantum wells is proposed. The method is based on exciton dispersion engineering by external fields. Using external fields one can, at any instant, provide resonant enhancement in PL and acoustic phonon emission by tuning ‘dark’ condensate into the resonance of recombination via direct exciton level. In addition, the development of a phonon laser is a possibility.