An ultracold, optically trapped mixture of 87Rb and metastable 4He atoms

Flores, Adonis Silva; Mishra, Hari Prasad; Vassen, W.; Knoop, Steven

doi:10.1140/epjd/e2017-70675-y

Cited by 10 publications

(8 citation statements)

References 81 publications

(152 reference statements)

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“…Mixtures of ultracold atomic gases provide an appealing platform for numerous avenues of research, including the realization of novel quantum phases [1][2][3][4][5][6][7], the formation of quantum droplets [8][9][10] and solitons [11,12], the study of collective dynamics [13][14][15], binary fluid dynamics and quantum turbulence [11,16], the investigation of Efimov physics [17][18][19][20], and the creation of ultracold polar molecules [21][22][23][24][25][26][27][28]. Early mixture experiments focused on bi-alkali-metal gases [29][30][31][32][33][34][35][36][37], but there is currently a growing interest in mixtures composed of alkali-metal and closed-shell atoms [38][39][40][41][42][43][44][45][46]...…”

Section: Introductionmentioning

confidence: 99%

Quantum degenerate mixtures of Cs and Yb

et al. 2021

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We report the production of quantum degenerate Bose-Bose mixtures of Cs and Yb with both attractive (Cs + 174 Yb) and repulsive (Cs + 170 Yb) interspecies interactions. Dual-species evaporation is performed in a bichromatic optical dipole trap that combines light at 1070 nm and 532 nm to enable control of the relative trap depths for Cs and Yb. Maintaining a trap which is shallower for Yb throughout the evaporation leads to highly efficient sympathetic cooling of Cs for both isotopic combinations at magnetic fields close to the Efimov minimum in the Cs three-body recombination rate at around 22 G. For Cs + 174 Yb, we produce quantum mixtures with typical atom numbers of N Yb ∼ 5 × 10 4 and N Cs ∼ 5 × 10 3 . We find that the attractive interspecies interaction (characterized by the scattering length a CsYb = −75a 0 ) is stabilized by the repulsive intraspecies interactions. For Cs + 170 Yb, we produce quantum mixtures with typical atom numbers of N Yb ∼ 4 × 10 4 and N Cs ∼ 1 × 10 4 . Here, the repulsive interspecies interaction (a CsYb = 96a 0 ) can overwhelm the intraspecies interactions, such that the mixture sits in a region of partial miscibility.

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Section: Introductionmentioning

confidence: 99%

Quantum degenerate mixtures of Cs and Yb

et al. 2021

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“…We predict scattering lengths for all isotopic combinations of Cs and Yb. We also demonstrate the independent production of 174 Yb and 133 Cs Bose-Einstein condensates using the same optical dipole trap, an important step towards the realization of a quantum-degenerate mixture of the two species.The realization of ultracold atomic mixtures [1][2][3][4][5][6][7][8][9][10][11][12] has opened up the possibility of exploring new regimes of few-and many-body physics. Such mixtures have been used to study Efimov physics [13][14][15], probe impurities in Bose gases [16], and entropically cool gases confined in an optical lattice [17].…”

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confidence: 99%

“…The realization of ultracold atomic mixtures [1][2][3][4][5][6][7][8][9][10][11][12] has opened up the possibility of exploring new regimes of few-and many-body physics. Such mixtures have been used to study Efimov physics [13][14][15], probe impurities in Bose gases [16], and entropically cool gases confined in an optical lattice [17].…”

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confidence: 99%

Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap

et al. 2017

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We present measurements of interspecies thermalization between ultracold samples of 133 Cs and either 174 Yb or 170 Yb. The two species are trapped in a far-off-resonance optical dipole trap and 133 Cs is sympathetically cooled by Yb. We extract effective interspecies thermalization cross sections by fitting the thermalization measurements to a kinetic model, giving σ Cs 174 Yb = (5 ± 2) × 10 −13 cm 2 and σ Cs 170 Yb = (18 ± 8) × 10 −13 cm 2 . We perform quantum scattering calculations of the thermalization cross sections and optimize the CsYb interaction potential to reproduce the measurements. We predict scattering lengths for all isotopic combinations of Cs and Yb. We also demonstrate the independent production of 174 Yb and 133 Cs Bose-Einstein condensates using the same optical dipole trap, an important step towards the realization of a quantum-degenerate mixture of the two species.The realization of ultracold atomic mixtures [1][2][3][4][5][6][7][8][9][10][11][12] has opened up the possibility of exploring new regimes of few-and many-body physics. Such mixtures have been used to study Efimov physics [13][14][15], probe impurities in Bose gases [16], and entropically cool gases confined in an optical lattice [17]. Pairs of atoms in the mixtures can be combined using magnetically or optically tunable Feshbach resonances to create ultracold molecules [18][19][20][21][22][23][24][25][26]. These ultracold molecules have a wealth of applications, such as tests of fundamental physics [27][28][29], realization of novel phase transitions [30][31][32], and the study of ultracold chemistry [33,34]. In addition, the long-range dipole-dipole interactions present between pairs of polar molecules make them useful in the study of dipolar quantum matter [35,36] and ultracold molecules confined in an optical lattice can simulate a variety of condensedmatter systems [37][38][39].Although the large majority of work on ultracold molecules has focused on bi-alkali systems, there is burgeoning interest in pairing alkali-metal atoms with divalent atoms such as Yb [40][41][42][43][44][45] or Sr [46]. The heteronuclear 2 Σ molecules formed in these systems have both an electric and a magnetic dipole moment in the ground electronic state. The extra magnetic degree of freedom opens up new possibilities for simulating a range of Hamiltonians for spins interacting on a lattice and for topologically protected quantum information processing [47].One of the challenging aspects of creating molecules in these systems is that the Feshbach resonances tend to be narrow and sparse. They are narrow because the main coupling responsible for them is the weak distance dependence of the alkali-metal hyperfine coupling, caused by the spin-singlet atom at short range [48] [48,49], and for some systems may be at impractically high magnetic fields. Amongst the various alkali-Yb combinations, CsYb has been proposed as the most favorable candidate because the high mass of Cs facilitates a higher density of bound states near threshold and its large hyperfi...

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“…Amongst the many alkali-closed-shell mixtures pursued [73][74][75][76][77][78][79], the majority of systems use alkali atoms paired with ytterbium (Yb). The main attraction of using Yb is that it possesses a large number of stable isotopes with different spin statistics.…”

Section: Why Csyb Molecules?mentioning

confidence: 99%

Photoassociation of Ultracold CsYb Molecules and Determination of Interspecies Scattering Lengths

Guttridge

2019

Springer Theses

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This thesis reports the first measurements of the ground state binding energies of CsYb molecules and the scattering lengths of the Cs+Yb system. The knowledge gained from these measurements will be essential for devising the most efficient route for the creation of rovibrational ground state CsYb molecules. CsYb molecules in the rovibrational ground state possess both electric and magnetic dipole moments which opens up a wealth of applications in many areas of physics and chemistry. I would not be where I am today without the support of my whole family. I would especially like to thank my Mam and Dad for for always pushing me forward in my endeavours and never letting me forget the important things in life.Finally, I must thank Steph for her endless love and support.

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An ultracold, optically trapped mixture of 87Rb and metastable 4He atoms

Cited by 10 publications

References 81 publications

Quantum degenerate mixtures of Cs and Yb

Quantum degenerate mixtures of Cs and Yb

Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap

Photoassociation of Ultracold CsYb Molecules and Determination of Interspecies Scattering Lengths

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