  Dipolar excitons offer a rich playground for both design of novel
optoelectronic devices and fundamental many-body physics. Wide GaN/(AlGa)N
quantum wells host a new and promising realization of dipolar excitons. We
demonstrate the in-plane confinement and cooling of these excitons, when
trapped in the electrostatic potential created by semitransparent electrodes of
various shapes deposited on the sample surface. This result is a prerequisite
for the electrical control of the exciton densities and fluxes, as well for
studies of the complex phase diagram of these dipolar bosons at low
temperature.
