  Dipolaritons are a three-way superposition of photon, a direct exciton, and
an indirect exciton that are formed in coupled quantum well microcavities. As
is the case with exciton-polaritons, dipolaritons have a self-interaction due
to direct and exchange effects of the underlying electrons and holes. Here we
present a theoretical description of dipolaritons and derive simple formulas
for their basic parameters. In particular, we derive the effective
dipolariton-dipolariton interaction taking into account of exchange effects
between the excitons. We obtain a simple relation to describe the effective
interaction at low densities. We find that dipolaritons should condense under
suitable conditions, described by a dissipative Gross-Pitaevskii equation.
While the parameters for condensation are promising, we find that the level of
tunability of the interactions is limited.
