In the dilute regime, electron-hole pairs form excitons which at low enough temperature undergo Bose-Einstein condensation in a linearly polarized state which is dark, unfortunately. Trapping a dark condensate, and thus knowing where it is, would greatly help to "see" it. This can be done through standing optical waves - even if dark excitons are not directly coupled to light. Under a density increase, carrier exchange between excitons brings a bright component to the condensate above a density threshold which may fall in the phase separation domaine between a dilute exciton gas and a dense electron-hole plasma. BCS condensation of "excitonic Cooper pairs" can take place in the dense plasma, making it superfluid - but not superconductor.
Exciton physics is definitely quite rich !