Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture

Ulmanis, Juris; Häfner, Stephan; Pires, R.; Werner, Félix; Petrov, D. S.; Kuhnle, E. D.; Weidemüller, Matthias

doi:10.1103/physreva.93.022707

Cited by 39 publications

(60 citation statements)

References 66 publications

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“…However, in the case of two heavy bosonic atoms of mass M (denoted H) and one light atom of mass m < M (denoted L), this factor can become significantly smaller than the value 22.7 for identical bosons [2,[12][13][14]. Relaxation and recombination losses near an interspecies resonance have recently been investigated in mixtures of Cesium and Lithium atoms and three consecutive Cs-Cs-Li Efimov resonances were observed in agreement with the predicted scaling relations [15][16][17][18][19]. The effect of the Cs-Cs scattering length on the Efimov resonances was investigated in Refs.…”

Section: K = Sgn(e)supporting

confidence: 48%

Tetramer bound states in heteronuclear systems

2017

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We calculate the universal spectrum of trimer and tetramer states in heteronuclear mixtures of ultracold atoms with different masses in the vicinity of the heavy-light dimer threshold. To extract the energies, we solve the three-and four-body problem for simple two-and three-body potentials tuned to the universal region using the Gaussian expansion method. We focus on the case of one light particle of mass m and two or three heavy bosons of mass M with resonant heavy-light interactions. We find that trimer and tetramer cross into the heavy-light dimer threshold at almost the same point and that as the mass ratio M/m decreases, the distance between the thresholds for trimer and tetramer states becomes smaller. We also comment on the possibility of observing exotic three-body states consisting of a dimer and two atoms in this region and compare with previous work.

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Section: K = Sgn(e)supporting

confidence: 48%

Tetramer bound states in heteronuclear systems

2017

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“…(25), −267a B and −1667a B , respectively, agree well with Ref. [24]. Similar good agreement between the first order perturbative treatment of a 22 corrections with experiments even in the large a 22 /a 12 regime is also seen in the correlations among the a (n) − values observed in Ref.…”

Section: Mentsupporting

confidence: 89%

“…[24] do not lie within the domain of validity of our a 22 /a 12 expansion, we find that their values predicted by Eq. (25), −267a B and −1667a B , respectively, agree well with Ref.…”

Section: Mentcontrasting

confidence: 57%

Effective-field-theory analysis of Efimov physics in heteronuclear mixtures of ultracold atomic gases

2016

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We use an effective field theory framework to analyze the Efimov effect in heteronuclear threebody systems consisting of two species of atoms with a large interspecies scattering length. In the leading-order description of this theory, various three-body observables in heteronuclear mixtures can be universally parameterized by one three-body parameter. We present the next-to-leading corrections, which include the effects of the finite interspecies effective range and the finite intraspecies scattering length, to various three-body observables. We show that only one additional three-body parameter is required to render the theory predictive at this order. By including the effective range and intraspecies scattering length corrections, we derive a set of universal relations that connect the different Efimov features near the interspecies Feshbach resonance. Furthermore, we show that these relations can be interpreted in terms of the running of the three-body counterterms that naturally emerge from proper renormalization. Finally, we make predictions for recombination observables of a number of atomic systems that are of experimental interest.

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“…(18) for each x to numerical values of phase shifts obtained from Eqs. (2) calculations for these systems [20,26,39,40] and are included in the S-wave three-body recombination rate for shallow and deep diatomic molecules.…”

Section: J =mentioning

confidence: 99%

Efimov effect for heteronuclear three-body systems at positive scattering length and finite temperature

et al. 2017

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We study the recombination process of three atoms scattering into an atom and diatomic molecule in heteronuclear mixtures of ultracold atomic gases with large and positive interspecies scattering length at finite temperature. We calculate the temperature dependence of the three-body recombination rates by extracting universal scaling functions that parametrize the energy dependence of the scattering matrix. We compare our results to experimental data for the 40 K-87 Rb mixture and make a prediction for 6 Li-87 Rb. We find that contributions from higher partial wave channels significantly impact the total rate and, in systems with particularly large mass imbalance, can even obliterate the recombination minima associated with the Efimov effect.

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Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture

Cited by 39 publications

References 66 publications

Tetramer bound states in heteronuclear systems

Tetramer bound states in heteronuclear systems

Effective-field-theory analysis of Efimov physics in heteronuclear mixtures of ultracold atomic gases

Efimov effect for heteronuclear three-body systems at positive scattering length and finite temperature

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