Quantum Gas of Deeply Bound Ground State Molecules
Abstract
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.
Cite
@article{arxiv.0806.2284,
title = {Quantum Gas of Deeply Bound Ground State Molecules},
author = {Johann G. Danzl and Elmar Haller and Mattias Gustavsson and Manfred J. Mark and Russell Hart and Nadia Bouloufa and Olivier Dulieu and Helmut Ritsch and Hanns-Christoph Naegerl},
journal= {arXiv preprint arXiv:0806.2284},
year = {2009}
}
Comments
4 figures