Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 3: Ultracold atoms, ions, and BEC I (joint session A/Q)
A 3.4: Vortrag
Montag, 9. März 2020, 12:00–12:15, f303
Efimov physics in strongly mass-imbalanced atom-dimer gases — •Panagiotis Giannakeas1 and Chris H. Greene2 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2Department of Physics and Astronomy, Purdue University, Indiana, USA
Three-body collisions in a two-species ultracold gases possess unique Efimovian idiosyncrasies. Indeed, for this particular colliding complex the magnitude and the sign intra- and inter-species scattering lengths can render an inherently different Efimovian landscape where the corresponding recombination spectra exhibit Efimov resonances intertwined with Stueckelberg suppression effects. Our current studies exploit these unique attributes of Efimov physics in mass-imbalanced systems by investigating the relevant scattering processes in atom-dimer gases. In particular, our analysis shows that the corresponding atom-dimer collisions are strongly enhanced when an Efimov bound state from the energetically closed three-body channel lies in the atom-dimer continuum, i.e. energetically open channel. Namely, our study demonstrates that in mass-imbalanced atom-dimer gases exists a series of atom-dimer resonances which fulfill a Fano-Feshbach scenario. In addition, we highlight the pivotal role of Stueckelberg physics on the width of the atom-dimer resonances where by adjusting the intra-species scattering length the atom-dimer continuum fully decouples from the Efimov states. Finally, our analysis addresses the universal aspects of this type of atom-dimer resonances, as well as, the importance of the Van der Waals physics.