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

Ulmanis, Juris; Häfner, Stephan; Pires, R.; Kuhnle, E. D.; Weidemüller, Matthias; Tiemann, E.

doi:10.1088/1367-2630/17/5/055009

Cited by 36 publications

(64 citation statements)

References 58 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)mentioning

confidence: 64%

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)mentioning

confidence: 64%

Tetramer bound states in heteronuclear systems

2017

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“…Two intermediately broad (s res ≈ 0.7 [33]) Cs-Li Feshbach resonances (FRs), located at approx. 843 G and 889 G, are well suited for the study of the heteronuclear Efimov scenario [33][34][35][36]. They are characterized by different sign and magnitude of the Cs-Cs scattering length a CsCs : while close to the 843 G resonance the intraspecies scattering length is large and negative a CsCs ≈ −1500 a 0 , the 889 G resonance is characterized by a small and positive a CsCs ≈ +190 a 0 [37].…”

Section: Comparison With Experiments a Cs-li Feshbach Resonancesmentioning

confidence: 99%

“…The experiment gives an even larger value for λ (1) due to the larger value of a (1) −,exp in comparison to the zero-range and vdW models. exp are extracted by fitting a Gaussian profile with linear background to the three-body loss rate L3(B) and conversion to scattering length a (n) −,exp via the parametrization given in [36]. The values in brackets represent the statistical, systematic and conversion error.…”

Section: Negative Intraspecies Scattering Lengthmentioning

confidence: 99%

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

et al. 2017

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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 ultracold Cs-Li mixture for negative [Pires et al., Phys. Rev. Lett. 112, 250404 (2014)] and positive Cs-Cs scattering length [Ulmanis et al., Phys. Rev. Lett. 117, 153201 (2016)]. Three theoretical models of increasing complexity are employed to quantify its influence on the scaling factor and the three-body parameter: a simple Born-Oppenheimer picture, a zero-range theory, and a spinless van der Waals model. These models are compared to Efimov resonances observed in an ultracold mixture of bosonic 133 Cs and fermionic 6 Li atoms close to two Cs-Li Feshbach resonances located at 843 G and 889 G, characterized by different sign and magnitude of the Cs-Cs interaction. By changing the sign and magnitude of the intraspecies scattering length different scaling behaviors of the three-body loss rate are identified, in qualitative agreement with theoretical predictions. The three-body loss rate is strongly influenced by the intraspecies scattering length.

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“…A further extension has been presented in Ref. [39] for mass-imbalanced three-body systems, which are in the focus of current experimental work 100 1000 10000 [ 18,19,40].…”

Section: Introductionmentioning

confidence: 99%

Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium

Sidorenkov

Grimm

2015

Phys. Rev. A

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We report a thorough investigation of finite-temperature effects on three-body recombination near a triatomic Efimov resonance in an ultracold gas of cesium atoms. Our measurements cover a wide range from a nearideal realization of the zero-temperature limit to a strongly temperature-dominated regime. The experimental results are analyzed within a recently introduced theoretical model based on a universal zero-range theory. The temperature-induced shift of the resonance reveals a contribution that points to an energy-dependence of the three-body parameter. We interpret this contribution in terms of the finite range of the van der Waals interaction in real atomic systems and we quantify it in an empirical way based on length scale arguments. A universal character of the corresponding resonance shift is suggested by observations related to other Efimov resonances and the comparison with a theoretical finite-temperature approach that explicitly takes the van der Waals interaction into account. Our findings are of importance for the precise determination of Efimov resonance positions from experiments at finite temperatures.

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

Cited by 36 publications

References 58 publications

Tetramer bound states in heteronuclear systems

Tetramer bound states in heteronuclear systems

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

Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium

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