Asymmetric Lineshapes of Efimov Resonances in Mass-Imbalanced Ultracold Gases

  title={Asymmetric Lineshapes of Efimov Resonances in Mass-Imbalanced Ultracold Gases},
  author={Panagiotis Giannakeas and Chris H. Greene},
The resonant profile of the rate coefficient for three-body recombination into a shallow dimer is investigated for mass-imbalanced systems. In the low-energy limit, three atoms collide with zero-range interactions, in a regime where the scattering lengths of the heavy–heavy and the heavy–light subsystems are positive and negative, respectively. For this physical system, the adiabatic hyperspherical representation is combined with a fully semi-classical method and we show that the shallow dimer… 
3 Citations

Figures and Tables from this paper

Dynamical excitation processes and correlations of three-body two-dimensional mixtures

A scheme is proposed to dynamically excite distinct eigenstate superpositions in three-body Bose-Fermi mixtures confined in a two-dimensional harmonic trap. The system is initialized in a

Efimov resonance position near a narrow Feshbach resonance in $^6$Li-$^{133}$Cs mixture

In the vicinity of a narrow Feshbach resonances Efimov features are expected to be characterized by the resonance’s properties rather than the van der Waals length of the interatomic potential.



Observation of Efimov resonances in a mixture with extreme mass imbalance.

We observe two consecutive heteronuclear Efimov resonances in an ultracold Li-Cs mixture by measuring three-body loss coefficients as a function of magnetic field near a Feshbach resonance. The first

Heteronuclear Efimov Scenario with Positive Intraspecies Scattering Length.

The three-body parameter at the three- body scattering threshold and the scaling factor between consecutive Efimov resonances are found to be controlled by the scattering length between the two bosons, approximately independent of short-range physics.

Testing universality of Efimov physics across broad and narrow Feshbach resonances

The emergence of Efimov states in ultracold atomic systems is expected to have a universal behaviour, but a new experimental study defies this expectation, reporting a clear deviation around a narrow

Three-body recombination in heteronuclear mixtures at finite temperature

Within the universal zero-range theory, we compute the three-body recombination rate to deep molecular states for two identical bosons resonantly interacting with each other and with a third atom of

Role of the intraspecies scattering length in the Efimov scenario with large mass difference

We experimentally and theoretically study the effect of the intraspecies scattering length onto the heteronuclear Efimov scenario, following up on our earlier observation of Efimov resonances in an

Evidence for Efimov quantum states in an ultracold gas of caesium atoms

The observation of an Efimov resonance in an ultracold gas of caesium atoms is reported and represents a starting point with which to explore the universal properties of resonantly interacting few-body systems.

Low-energy three-body dynamics in binary quantum gases

The universal three-body dynamics in ultra-cold binary Fermi and Fermi–Bose mixtures is studied. Two identical fermions of mass m and a particle of mass m1 with the zero-range two-body interaction in

Test of the universality of the three-body Efimov parameter at narrow Feshbach resonances.

The observed ratio of the three-body parameter with the van der Waals radius is approximately the same universal ratio as for broader resonances, suggesting the presence of a new regime for three- body scattering at narrow resonances.

Universal three-body parameter in heteronuclear atomic systems.

It is shown that for a system composed of two light and one heavy atom, the physical origin of the universal 3BP is similar to the homonuclear case, while for systems composed by one light and two heavy atoms, the universality is now mostly controlled by the heavy-heavy interatomic properties.

Universality of weakly bound dimers and Efimov trimers close to Li–Cs Feshbach resonances

We study the interspecies scattering properties of ultracold Li–Cs mixtures in their two energetically lowest spin channels in the magnetic field range between 800 and 1000 G. Close to two broad