Production of quantum-degenerate mixtures of ytterbium and lithium with controllable interspecies overlap

Hansen, Anca Daniela; Khramov, Alexander; Dowd, William; Jamison, Alan O.; Plotkin-Swing, Benjamin; Roy, Richard; Gupta, Subhadeep

doi:10.1103/physreva.87.013615

Cited by 53 publications

(50 citation statements)

References 30 publications

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“…The resulting trap frequencies are (ω x , ω y , ω z ) = 2π × (17, 110, 10) Hz. Following this method we can reliably create pure 174 Yb condensates of 1.2 × 10 6 atoms, a factor of 4 improvement over the largest reported Yb BEC number [24], with a total cycle time of 15 s.…”

Section: Application To Large Bec Productionmentioning

confidence: 99%

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Rapid cooling to quantum degeneracy in dynamically shaped atom traps

et al. 2016

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We report on a general method for the rapid production of quantum degenerate gases. Using 174 Yb, we achieve an experimental cycle time as low as (1.6 − 1.8) s for the production of BoseEinstein condensates (BECs) of (0.5−1)×10 5 atoms. While laser cooling to 30 µK proceeds in a standard way, evaporative cooling is highly optimized by performing it in an optical trap that is dynamically shaped by utilizing the time-averaged potential of a single laser beam moving rapidly in one dimension. We also produce large (> 10 6 ) atom number BECs and successfully model the evaporation dynamics over more than three orders of magnitude in phase space density. Our method provides a simple and general approach to solving the problem of long production times of quantum degenerate gases.

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Section: Application To Large Bec Productionmentioning

confidence: 99%

“…We perform our experiment in the apparatus described in [24] using 174 Yb bosons. Our laser cooling procedure can produce 10 8 atoms in 5 s at 30 µK in a compressed magneto-optical trap (MOT) operating on the 1 S 0 → 3 P 1 transition.…”

Section: Methodsmentioning

confidence: 99%

Rapid cooling to quantum degeneracy in dynamically shaped atom traps

et al. 2016

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“…The preparation of the dual superfluid involves significant extensions to our earlier cooling methods for the dual-species Yb-Li system [17] (see supplemental material [18]). Briefly, we load laser-cooled atoms into a crossed-beam 1064 nm optical dipole trap (ODT) optimized for efficient evaporative cooling by dynamically changing the trap shape [19].…”

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confidence: 99%

Two-Element Mixture of Bose and Fermi Superfluids

et al. 2017

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We report on the production of a stable mixture of bosonic and fermionic superfluids composed of the elements 174 Yb and 6 Li which feature a strong mismatch in mass and distinct electronic properties. We demonstrate elastic coupling between the superfluids by observing the shift in dipole oscillation frequency of the bosonic component due to the presence of the fermions. The measured magnitude of the shift is consistent with a mean-field model and its direction determines the previously unknown sign of the interspecies scattering length to be positive. We also observe the exchange of angular momentum between the superfluids from the excitation of a scissors mode in the bosonic component through interspecies interactions. We explain this observation using an analytical model based on superfluid hydrodynamics.Ultracold atomic gases offer excellent opportunities to produce and investigate quantum matter, allowing fundamental studies in many-body physics and quantum simulation [1]. Beginning with the cooling of atoms to BoseEinstein condensation [2,3] and later followed by the achievement of superfluidity in atomic Fermi gases [4], such studies have found many parallels with the analogous superfluids of bosonic 4 He and fermionic 3 He as well as superconductors, familiar from condensed matter physics. While the goal of simultaneous superfluidity in mixtures of 4 He-3 He still remains elusive due to strong inter-isotope interactions [5,6], Bose-Fermi superfluidity in an atomic gas isotopic mixture of 7 Li-6 Li has recently been realized [7]. The original interest [8,9] in such dual superfluid systems is now strongly intensified [10][11][12][13][14][15][16].The extension of Bose-Fermi superfluidity to mixtures of different elements is experimentally challenging, but holds the potential to open a larger arena of scientific studies. A large mass ratio between the components is predicted to alter the interaction energy between the superfluids [12] as well as the character of excitations across the Bose-Einstein condensate to Bardeen-CooperSchreiffer (BEC-BCS) crossover for the fermion pairs [15]. Specific interaction strengths and mass ratios can aid the detection of exotic states such as the FuldeFerrell-Larkin-Ovchinnikov (FFLO) phase [10] and darkbright solitons [16]. Furthermore, species-selective potentials for relative positioning and selective addressing make two-element systems more amenable for systematic studies.In this paper, we report on the realization of a twoelement Bose-Fermi superfluid mixture of 174 Yb-6 Li. We measure their coupling by observing the interactioninduced frequency shift of the bosonic dipole mode. We also detect transfer of angular momentum between the superfluids through the excitation of a scissors mode in the bosonic component. The scattering length a F of the two-spin alkali 6 Li fermionic system is tunable across the BEC-BCS crossover through a Feshbach resonance centered at 832 G, while the scattering length a B of the alkaline-earth-like bosonic Yb remains constant throughout. The...

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“…For the Cs+Yb system a dual magneto-optical trap was created [28] and, more recently, the interspecies thermalization properties of the mixture in an optical trap [29] were investigated. The cotrapping of Li+Yb mixtures was studied by Hara et al [30] and Hansen et al [31]. Interestingly, magnetic Feshbach resonances in collisions of electronically excited Yb( 3 P 2 ) and Li were reported.…”

Section: Introductionmentioning

confidence: 99%

Optical Feshbach resonances and ground-state-molecule production in the RbHg system

et al. 2017

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We present the prospects for photoassociation, optical control of interspecies scattering lengths and finally, the production of ultracold absolute ground state molecules in the Rb+Hg system. We use the "gold standard" ab initio methods for the calculations of ground (CCSD(T)) and excited state (EOM-CCSD) potential curves. The RbHg system, thanks to the wide range of stable Hg bosonic isotopes, offers possibilities for mass-tuning of ground state interactions. The optical lengths describing the strengths of optical Feshbach resonances near the Rb transitions are favorable even at large laser detunings. Ground state RbHg molecules can be produced with efficiencies ranging from about 20% for deeply bound to at least 50% for weakly bound states close to the dissociation limit. Finally, electronic transitions with favorable Franck-Condon factors can be found for the purposes of a STIRAP transfer of the weakly bound RbHg molecules to the absolute ground state using commercially available lasers.

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Production of quantum-degenerate mixtures of ytterbium and lithium with controllable interspecies overlap

Cited by 53 publications

References 30 publications

Rapid cooling to quantum degeneracy in dynamically shaped atom traps

Rapid cooling to quantum degeneracy in dynamically shaped atom traps

Two-Element Mixture of Bose and Fermi Superfluids

Optical Feshbach resonances and ground-state-molecule production in the RbHg system

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