Overlapping Bose-Einstein condensates of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Na</mml:mi><mml:mprescripts /><mml:none /><mml:mn>23</mml:mn></mml:mmultiscripts></mml:math>
 and 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Cs</mml:mi><mml:mprescripts /><mml:none /><mml:mn>133</mml:mn></mml:mmultiscripts></mml:math>

Warner, Claire; Lam, Aden Z.; Bigagli, Niccolò; Liu, Henry C.; Stevenson, Ian; Will, Sebastian

doi:10.1103/physreva.104.033302

Cited by 24 publications

(16 citation statements)

References 81 publications

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“…It is a first step in the exploration of strong-correlation physics in degenerate Bose-Fermi systems and provides a benchmark for their theoretical understanding. Our method can be readily extended to other Bose-Fermi mixtures for producing large degenerate samples of fermionic molecules and may help to achieve a heteronuclear molecular BEC from Bose-Bose mixtures which suffer from even more severe losses when both bosonic species condense [40][41][42][43][44][45]. Ultimately our technique allows us to produce a gas of nonreactive ground-state molecules in the quantum-degenerate regime with five times stronger molecular-frame dipole moments than the first degenerate polar molecules of KRb.…”

Section: Discussionmentioning

confidence: 98%

Transition from a polaronic condensate to a degenerate Fermi gas of heteronuclear molecules

Duda¹,

Schindewolf²,

Bause³

et al. 2021

Preprint

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The interplay of quantum statistics and interactions in atomic Bose-Fermi mixtures leads to a phase diagram markedly different from pure fermionic or bosonic systems. However, investigating this phase diagram remains challenging when bosons condense. Here, we observe evidence for a quantum phase transition from a polaronic to a molecular phase in a density-matched degenerate Bose-Fermi mixture. The condensate fraction, representing the order parameter of the transition, is depleted by interactions and the build-up of strong correlations results in the emergence of a molecular Fermi gas. By driving through the transition, we ultimately produce a quantumdegenerate sample of sodium-potassium molecules exhibiting a large molecule-frame dipole moment of 2.7 Debye. The observed phase transition represents a new phenomenon complementary to the paradigmatic BEC-BCS crossover observed in Fermi systems. DEGENERATE BOSE-FERMI MIXTURES IN THE DENSITY-MATCHED REGIMEA simplified phase diagram of Bose-Fermi mixtures is illustrated in Fig. 1a as a function of the ratio of boson to fermion density n B /n F and the dimensionless interaction strength 1/k i a BF . Here, a BF denotes the bosonfermion scattering length and the wave vector k i is deter-

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Section: Discussionmentioning

confidence: 98%

Transition from a polaronic condensate to a degenerate Fermi gas of heteronuclear molecules

Duda¹,

Schindewolf²,

Bause³

et al. 2021

Preprint

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“…The measurement of this tune-out wavelength will be useful in future studies of quantum degenerate mixtures involving Cs [68][69][70][71][72]. For example, a stirring beam at this wavelength could be used to create vortices in the atomic species trapped with Cs, without affecting the Cs condensate.…”

Section: Discussionmentioning

confidence: 99%

Measurement of the tune-out wavelength for Cs133 at 880 nm

et al. 2021

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We perform a measurement of the tune-out wavelength, λ 0 , between the D 1 , 6 2 S 1/2 → 6 2 P 1/2 , and D 2 , 6 2 S 1/2 → 6 2 P 3/2 , transitions for 133 Cs in the ground hyperfine state (F = 3, m F = +3). At λ 0 , the frequencydependent scalar polarizability is zero leading to a zero scalar ac Stark shift. We measure the polarizability as a function of wavelength using Kapitza-Dirac scattering of a 133 Cs Bose-Einstein condensate in a one-dimensional optical lattice, and determine the tune-out wavelength to be λ 0 = 880.21790( 40) stat (8) sys nm. From this measurement we determine the ratio of reduced matrix elements to be 1.9808(2). This represents an improvement of a factor of 10 over previous results derived from excited-state lifetime measurements. We use the present measurement as a benchmark test of high-precision theory.

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“…In earlier work, NaCs molecules have been created from laser-cooled mixtures of Na and Cs [35][36][37][38] and single NaCs molecules have been created in optical tweezer traps [39][40][41]. The present work constitutes a first step to-wards ultracold bulk gases of NaCs molecules, enabled by our recent demonstration of miscible and overlapping quantum gas mixtures of Na and Cs [42]. Due to its large dipole moment, NaCs is a promising candidate for the realization of novel many-body phases in strongly interacting dipolar quantum matter [15][16][17][18][19], making the pursuit of a BEC of NaCs ground state molecules an exciting goal.…”

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confidence: 91%

“…At the end of evaporation the trap frequencies are {ω x , ω y , ω z } = 2π × {74(1), 54(1), 332(7)} Hz (measured for Na). At B prep the intra-and interspecies scattering lengths are such that Na and Cs clouds are miscible [42].…”

mentioning

confidence: 99%

“…For Na, the initial numbers range from 3.5×10 6 to 5×10 5 and, for Cs, from 9×10 5 to 4×10 4 atoms. The Na temperatures are typically slightly lower than the Cs temperatures due to a lag in thermalization of Cs during sympathetic cooling with Na [42]. We use the Cs temperature, T Cs , as a parameter that characterizes the starting conditions at B prep prior to association.…”

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confidence: 99%

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A High Phase-Space Density Gas of NaCs Feshbach Molecules

Lam,

Bigagli,

Warner

et al. 2022

Preprint

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We report on the creation of ultracold gases of bosonic Feshbach molecules of NaCs. The molecules are associated from overlapping gases of Na and Cs using a Feshbach resonance at 864.12(5) G. We characterize the Feshbach resonance using bound state spectroscopy, in conjunction with a coupled-channel calculation. By varying the temperature and atom numbers of the initial atomic mixtures, we demonstrate the association of NaCs gases over a wide dynamic range of molecule numbers and temperatures, reaching 60 nK for our coldest systems and a phase-space density (PSD) near 0.1. This is an important stepping-stone for the creation of degenerate gases of strongly dipolar NaCs molecules in their absolute ground state.

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Overlapping Bose-Einstein condensates of Na23 and Cs133

Cited by 24 publications

References 81 publications

Transition from a polaronic condensate to a degenerate Fermi gas of heteronuclear molecules

Transition from a polaronic condensate to a degenerate Fermi gas of heteronuclear molecules

Measurement of the tune-out wavelength for Cs133 at 880 nm

A High Phase-Space Density Gas of NaCs Feshbach Molecules

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