Quantum Gas of Deeply Bound Ground State Molecules

Details Quantum Gas of Deeply Bound Ground State Molecules Quantum Gas of Deeply Bound Ground State Molecules

2008-06-13

arxiv.org/abs/0806.2284v1

Physics

Condensed Matter

Other Condensed Matter

4 figures

Scientific paper

10.1126/science.1159909

We create an ultracold dense quantum gas of ground state molecules bound by more than 1000 wavenumbers by stimulated two-photon transfer of molecules associated on a Feshbach resonance from a Bose-Einstein condensate of cesium atoms. The transfer efficiency exceeds 80%. In the process, the initial loose, long-range electrostatic bond of the Feshbach molecule is coherently transformed into a tight chemical bond. We demonstrate coherence of the transfer in a Ramsey-type experiment and show that the molecular sample is not heated during the transfer. Our results show that the preparation of a quantum gas of molecules in arbitrary rovibrational states is possible and that the creation of a Bose-Einstein condensate of molecules in their rovibronic ground state is within reach.

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