Controlled Production of Sub-Radiant States of a Diatomic Molecule in an   Optical Lattice
  We report successful production of sub-radiant states of a two-atom system in a three-dimensional optical lattice starting from doubly occupied sites in a Mott insulator phase of a quantum gas of atomic ytterbium. We can selectively produce either sub-radiant 1g state or super-radiant 0u state by choosing the excitation laser frequency. The inherent weak excitation rate for the sub-radiant 1g state is overcome by the increased atomic density due to the tight-confinement in a three-dimensional optical lattice. Our experimental measurements of binding energies, linewidth, and Zeeman shift confirm observation of sub-radiant levels of the 1g state of the Yb_2 molecule. 
Yosuke Takasu, Yutaka Saito, Yoshiro Takahashi, Mateusz Borkowski,   Roman Ciury{\l}o, Paul S. Julienne
physics.atom-ph cond-mat.quant-gas