Photoassociation of Universal Efimov Trimers

Abstract

In view of recent experiments in ultracold atomic systems, the photoassociation of Efimov trimers, composed of three identical bosons, is studied utilizing the multipole expansion. We study both the normal hierarchy case, where one-body current is dominant, and the strong hierarchy case, relevant for photoassociation in ultracold atoms, where two-body current is dominant. For identical particles in the normal hierarchy case, the leading contribution comes from the r^2 s-mode operator and from the quadrupole d-mode operator. The s-mode reaction is found to be dominant at low temperature, while as the temperature increases the d-mode becomes as significant. For the strong hierarchy case, the leading contribution comes from a 2-body s-wave δ operator. In both cases log periodic oscillations are found in the cross section. For large but finite scattering length the amplitude of the oscillations becomes larger in comparison to infinite scattering length case. We apply our theory to photoassociation of 7Li ultracold atoms and show a good fit to the available experimental results.

References in corpus (10)

• Radio Frequency Association of Efimov Trimers
• Efimov Resonances in Ultracold Quantum Gases
• Universal Relations for Identical Bosons from 3-Body Physics
• Radio-Frequency Transitions on Weakly-Bound Ultracold Molecules
• Association of Efimov trimers from a three-atom continuum
• Study of Efimov physics in two nuclear-spin sublevels of 7Li
• Association of molecules using a resonantly modulated magnetic field
• Molecule Formation in Optical Lattice Wells by Resonantly Modulated Magnetic Fields
• Multipole Analysis of Radio-Frequency Reactions in Ultra-Cold Atoms
• Photo Reactions with Universal Trimers