Universal Three-Body Physics in Ultracold KRb Mixtures

Wacker, L. J.; Jørgensen, Nils B.; Birkmose, Dorthe; Winter, N.; Mathias, Mikkelsen,; Sherson, Jacob; Zinner, N. T.; Arlt, Jan J.

doi:10.1103/physrevlett.117.163201

Cited by 55 publications

(54 citation statements)

References 55 publications

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“…Recent studies on the three-body recombination coefficient of the K-Rb systems [20,23,24] showed that there is no Efimov-related resonance in the region of 200 a 0 < |a| < 3000 a 0 . Furthermore, the single-channel universal theory on the heteronuclear Efimov resonance for broad resonance predicts that there is no resonance in the region of |a| < 2800 a 0 [14].…”

Section: K Atoms Andmentioning

confidence: 99%

“…Additionally, we enhanced the three-body loss by increasing the atomic density [41]. The observed three-body loss coefficient (Fig.2) did not show any Efimov-like structures [24].…”

Section: K Atoms Andmentioning

confidence: 99%

“…There are several experimental groups working on different isotopes for the KRb mixture [20,[22][23][24] G. This resonance is well isolated from other Feshbach resonances and thus it can be simply described by the combination of s res (= 1.96) and r bg (= −2.75) [27]. The purpose of comparing these two KRb systems is twofold.…”

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confidence: 99%

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Isotopic Shift of Atom-Dimer Efimov Resonances in K-Rb Mixtures: Critical Effect of Multichannel Feshbach Physics

et al. 2017

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The multichannel Efimov physics is investigated in ultracold heteronuclear admixtures of K and Rb atoms. We observe a shift in the scattering length where the first atom-dimer resonance appears in the 41 K-87 Rb system relative to the position of the previously observed atom-dimer resonance in the 40 K-87 Rb system. This shift is well explained by our calculations with a three-body model including the van der Waals interactions, and, more importantly, the multichannel spinor physics. With only minor difference in the atomic masses of the admixtures, the shift in the atom-dimer resonance positions can be cleanly ascribed to the isolated and overlapping Feshbach resonances in the 40 K-87 Rb and 41 K-87 Rb systems, respectively. Our study demonstrates the role of the multichannel Feshbach physics in determining Efimov resonances in heteronuclear three-body systems.If physical systems exhibit properties that are independent of details of interaction, they are called universal [1]. Universality has played a central role in the analysis of quantum degenerate gases, e.g., the effects of binary collisions were successfully characterized by a single parameter, the s-wave scattering length a, independent of the details of the two-body potential. For few-body phenomena, however, it has been well known that an additional parameter -e.g. three-body parameter [1] -is necessary for a complete description of the system. Efimov states, an infinite series of three-body bound states with discrete scale invariance when a two-body scattering length diverges [2], provided us a unique opportunity to investigate the properties of three-body parameter both theoretically and experimentally. Combined experimental effort to observe Efimov-related resonance provided us with unexpected constancy of three-body parameters [3][4][5][6][7][8][9], while detailed theoretical analysis showed the origin of this constancy in some limiting cases [10,11].Recently, a newly developed three-body spinor model that included both van der Waals interactions and multichannel Feshbach physics has succeeded in reproducing many experimentally observed Efimov features in homonuclear atomic systems [12]. This model involves additional parameters that characterize Feshbach resonances, such as the background scattering length of an open channel normalized by the van der Waals length (r bg ) and the resonance strength of a closed channel (s res ). It was impressive to see that predictions from a three-body model constructed to reproduce only twobody Feshbach physics match almost perfectly with the experimentally observed three-body features in homonuclear systems [12,13]. This achievement suggests that the necessity of including precise few-body short-range chemical forces in studies of universal few-body phenomena -a task far beyond our current capability -may be removed.Extending this universal theory to heteronuclear systems is the next big challenge. In addition to the mass ratio, heteronuclear systems have the extra complication of having both inter-and intra-spe...

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Section: K Atoms Andmentioning

confidence: 99%

“…Additionally, we enhanced the three-body loss by increasing the atomic density [41]. The observed three-body loss coefficient (Fig.2) did not show any Efimov-like structures [24].…”

Section: K Atoms Andmentioning

confidence: 99%

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Isotopic Shift of Atom-Dimer Efimov Resonances in K-Rb Mixtures: Critical Effect of Multichannel Feshbach Physics

et al. 2017

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“…This motivated for example the first experimental measurement in heteronuclear atomic systems by the Florence group [7] and, more recently, the experiments reported in Refs. [8][9][10][11]. Such systems also exist in nuclear physics as neutron-rich halo nuclei, which are weakly bound nuclei consisting of a tightly bound core and a small number of valence neutrons [12,13].…”

Section: Introductionmentioning

confidence: 99%

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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“…In recent years, interest has turned to mixtures of quantum gases and the tuning of interspecies interactions. This interest is motivated by the study of exotic phases such as supersolids [19], the heteronuclear Efimov scenario for a three-body system [20][21][22], boson-mediated superfluids [23], quantum phases that involve composite fermions [24], mixtures under simultaneous superfluidity [25], and the possibility of forming samples of ultracold polar ground-state molecules [26]. In particular, the electric dipole moment of heteronuclear molecules gives rise to anisotropic, long-range dipole-dipole interactions that contrast with the isotropic, short-range interaction in atomic experiments [27,28].…”

Section: Introductionmentioning

confidence: 99%

Observation of interspecies Feshbach resonances in an ultracold K39−Cs133 mixture and refinement of interaction potentials

et al. 2017

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We observe interspecies Feshbach resonances due to s-wave bound states in ultracold 39 K-133 Cs scattering for three different spin mixtures. The resonances are observed as joint atom loss and heating of the K sample. We perform least-squares fits to obtain improved K-Cs interaction potentials that reproduce the observed resonances, and carry out coupled-channel calculations to characterize the scattering and bound-state properties for 39 K-Cs, 40 K-Cs and 41 K-Cs. Our results open up the possibilities of tuning interactions in K-Cs atomic mixtures and of producing ultracold KCs molecules.

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Universal Three-Body Physics in Ultracold KRb Mixtures

Cited by 55 publications

References 55 publications

Isotopic Shift of Atom-Dimer Efimov Resonances in K-Rb Mixtures: Critical Effect of Multichannel Feshbach Physics

Isotopic Shift of Atom-Dimer Efimov Resonances in K-Rb Mixtures: Critical Effect of Multichannel Feshbach Physics

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

Observation of interspecies Feshbach resonances in an ultracold K39−Cs133 mixture and refinement of interaction potentials

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