  We study few-particle interactions in GaN-coupled quantum dots and discuss
how the built-in field characteristic of these structures strongly reinforce
dipole-dipole and dipole-monopole interactions.
  We introduce a semi-analytical model which allows for a rapid and easy
estimate of the magnitude of few-particle interactions and whose predictions
are closer than 10% to ``exact'' results. We apply our study to the design of
an all-optical read-out device which exploits long-range dipole-monopole
interactions and may be also used to monitor the charge status of a quantum dot
system.
