  We investigate the spectrum and structure of two-heavy bosonic impurities
immersed in a light-boson system in D dimensions by means of the
Born-Oppenheimer approximation. The fractional dimension dependence are
associated with squeezed traps. The binding energies follows an Efimov type
geometrical scaling law when the heavy-light system has a s-wave resonant
interaction and the effective dimension or trap deformation is within a given
range. The discrete scaling parameter $s$ relates two consecutive many-body
bound states depending on mass asymmetry, number of light-bosons and effective
dimension D. Furthermore, the spectrum and wave-function for finite heavy-light
binding energies are computed. To exemplify our results, we consider mixtures
of two-heavy caesium atoms interacting with up to two-lithium ones, which are
systems of current experimental interest.
