  We show that geometrically coupled polariton condensates fabricated in
semiconductor devices are versatile systems capable of simulating molecules
with given characteristics. In particular, we consider oscillatory and
stationary symmetric and asymmetric states in polariton dimers, trimers, and
tetrads and their luminosity in real and Fourier space. The spectral weights of
oscillatory states are associated with discrete spectral lines. Their number
and separation can be controlled by changing the number and geometry of
condensates, reflected by the coupling strengths. We also show that asymmetric
stationary states combine discrete and continuous degrees of freedom in one
system. The continuous degree of freedom is represented by the phase while the
discrete degree of freedom is given by density asymmetry. Our work paves the
way to engineer controllable artificial molecules with a range of properties
manufactured on demand.
