Creating a Quantum Degenerate Gas of Stable Molecules via Weak Photoassociation
arXiv:1003.1757 · doi:10.1103/PhysRevA.82.011609
Abstract
Quantum degenerate molecules represent a new paradigm for fundamental studies and practical applications. Association of already quantum degenerate atoms into molecules provides a crucial shortcut around the difficulty of cooling molecules to ultracold temperatures. Whereas association can be induced with either laser or magnetic fields, photoassociation requires impractical laser intensity to overcome poor overlap between the atom pair and molecular wavefunctions, and experiments are currently restricted to magnetoassociation. Here we model realistic production of a quantum degenerate gas of stable molecules via two-photon photoassociation of Bose-condensed atoms. An adiabatic change of the laser frequency converts the initial atomic condensate almost entirely into stable molecular condensate, even for low-intensity lasers. Results for dipolar LiNa provide an upper bound on the necessary photoassociation laser intensity for alkali-metal atoms ~30 W/cm^2, indicating a feasible path to quantum degenerate molecules beyond magnetoassociation.
arXiv comment4 pages, 5 figures, 1 table, 39 references; published version (essentially)
References in corpus (24)
- A High Phase-Space-Density Gas of Polar Molecules
- Quantum computation with trapped polar molecules
- Production of cold molecules via magnetically tunable Feshbach resonances
- Ultracold Molecules in the Ro-Vibrational Triplet Ground State
- Superchemistry: dynamics of coupled atomic and molecular Bose-Einstein condensates
- Cold Molecule Spectroscopy for Constraining the Evolution of the Fine Structure Constant
- Quantum gas of rovibronic ground-state molecules in an optical lattice
- Photoassociative Production and Trapping of Ultracold KRb Molecules
- Production of Ultracold, Polar RbCs* Molecules via Photoassociation
- Atom-molecule dark states in a Bose-Einstein condensate
- Photoassociation of sodium in a Bose-Einstein condensate
- Stimulated Raman adiabatic passage from an atomic to a molecular Bose-Einstein condensate
- Holographic quantum computing
- The quantitative condition is necessary in guaranteeing the validity of the adiabatic approximation
- Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance
- Bose-enhanced chemistry: Amplification of selectivity in the dissociation of molecular Bose-Einstein condensates
- Rate limit for photoassociation of a Bose-Einstein condensate
- Prospects for application of ultracold Sr molecules in precision measurements
- Improved efficiency of stimulated Raman adiabatic passage in photoassociation of a Bose-Einstein condensate
- Cross-Molecular Coupling in Combined Photoassociation and Feshbach Resonances
- Feshbach resonances in ultracold ^{6,7}Li + ^{23}Na atomic mixtures
- Inelastic Collisions in an Ultracold quasi-2D Gas
- Two-body transients in coupled atomic-molecular BECs
- Coherent bimolecular reactions with quantum-degenerate matter waves