Density effects on the interferometry of Efimov states by modulating magnetic fields

TL;DR

This paper investigates how the density profile of a thermal gas influences the interferometric signals of Efimov states modulated by magnetic fields, revealing shifts in oscillation frequencies due to density effects.

Contribution

It extends previous models by incorporating the density profile of a thermal gas, showing how it affects Efimov state interference patterns and oscillation frequencies.

Findings

Density profile causes lower frequency shifts in fringes.

Superposition of Efimov trimer with atom-dimer remains unchanged.

Trap state contributions are smeared out by the density profile.

Abstract

Dynamical association of Efimov trimers in thermal gases by means of modulated magnetic fields has proven very fruitful in determining the binding energy of trimers. The latter was extracted from the number of remaining atoms, which featured oscillatory fringes stemming from the superposition of trimers with atom-dimers. Subsequent theoretical investigations utilizing the time-dependent three-body problem revealed additional association mechanisms, manifested as superpositions of the Efimov state with the trap states and the latter with atom-dimers. The three atoms were initialized in a way to emulate a thermal gas with uniform density. Here, this analysis is extended by taking into account the effects of the density profile of a semi-classical thermal gas. The supersposition of the Efimov trimer with the first atom-dimer remains the same, while the frequencies of highly oscillatory fringes shift to lower values. The latter refer to the frequencies of trimers and atom-dimers in free space since the density profile smears out the contribution of trap states.