Electromagnetically induced transparency in an atom-molecule   Bose-Einstein condensate
  We propose a new measurement scheme for the atom-molecule dark state by using electromagnetically induced transparency (EIT) technique. Based on a density-matrix formalism, we calculate the absorption coefficient numerically. The appearance of the EIT dip in the spectra profile gives clear evidence for the creation of the dark state in the atom-molecule Bose-Einstein condensate. 
Guang-Ri Jin, Chul Koo Kim, and Kyun Nahm