Interferometry of Efimov states in thermal gases by modulated magnetic fields

Abstract

We demonstrate that an interferometer based on modulated magnetic field pulses enables precise characterization of the energies and lifetimes of Efimov trimers irrespective of the magnitude and sign of the interactions in 85Rb thermal gases. Despite thermal effects, interference fringes develop when the dark time between the pulses is varied. This enables the selective excitation of coherent superpositions of trimer, dimer and free atom states. The interference patterns possess two distinct damping timescales at short and long dark times that are either equal to or twice as long as the lifetime of Efimov trimers, respectively. Specifically, this behavior at long dark times provides an interpretation of the unusually large damping timescales reported in a recent experiment with 7Li thermal gases [Phys. Rev. Lett. 122, 200402 (2019)]. Apart from that, our results constitute a stepping stone towards a high precision few-body state interferometry for dense quantum gases.

10 pages, 3 figures

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Cited by in corpus (5)

• Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum
• The role of the effective range in strongly-interacting few-body systems
• Density effects on the interferometry of Efimov states by modulating magnetic fields
• Efimov Effect in Ultracold Microwave-Shielded Polar Molecules
• Competition of light- and phonon-dressing in microwave-dressed Bose polarons