Condensate wave function and elementary excitations of bosonic polar   molecules: beyond the first Born approximation
  We investigate the condensate wave function and elementary excitations of strongly interacting bosonic polar molecules in a harmonic trap, treating the scattering amplitude beyond the standard first Born approximation (FBA). By using an appropriate trial wave function in the variational method, effects of the leading order correction beyond the FBA have been investigated and shown to be significantly enhanced when the system is close to the phase boundary of collapse. How such leading order effect of going beyond the FBA can be observed in a realistic experiment is also discussed. 
Chao-Chun Huang, Daw-Wei Wang, and W. C. Wu
cond-mat.quant-gas cond-mat.other