Creating a Quantum Degenerate Gas of Stable Molecules via Weak Photoassociation

Details Creating a Quantum Degenerate Gas of Stable Molecules via Weak Photoassociation Creating a Quantum Degenerate Gas of Stable Molecules via Weak Photoassociation

2010-03-08

arxiv.org/abs/1003.1757v2

Phys. Rev. A 82, 011609(R) (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 5 figures, 1 table, 39 references; published version (essentially)

Scientific paper

10.1103/PhysRevA.82.011609

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.

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