Prospects of forming ultracold molecules in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mn>2</mml:mn></mml:msup><mml:mi>Σ</mml:mi></mml:mrow></mml:math>states by magnetoassociation of alkali-metal atoms with Yb

Brue, Daniel A.; Hutson, Jeremy M.

doi:10.1103/physreva.87.052709

Cited by 75 publications

(143 citation statements)

References 64 publications

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“…The calculated interspecies scattering lengths are moderately positive for Yb isotopes from 168 to 172, close to zero for 173, and moderately negative for 174. The scattering length for Cs 176 Yb is predicted to be very large, which may produce relatively broad Feshbach resonances [49].…”

Section: Calculated Cross Sections and Extraction Of Scattering Lmentioning

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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Section: Calculated Cross Sections and Extraction Of Scattering Lmentioning

confidence: 99%

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

et al. 2017

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“…In the present work, we assume that all the atomic coupling constants are independent of the internuclear distance R. Any variation of these constants could be introduced as an additional term in the interaction operatorĤ 12 , as has been done, for example, for the R dependence of hyperfine interactions for the interactions between alkali-metal atoms and closed-shell atoms [36,37]. Such effects might include, for example, the distance dependence of the spin-orbit coupling constant a so or a nuclear quadrupole interaction in atom A (if i 1 1) as a result of the breakdown of its spherical symmetry when the two atoms approach one another.…”

Section: A Collision Hamiltonianmentioning

confidence: 99%

Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

González-Martínez

Hutson²

2013

Phys. Rev. A

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We consider the prospect of using ultracold hydrogen atoms for sympathetic cooling of fluorine atoms to microkelvin temperatures. We carry out quantum-mechanical calculations on collisions between cold F and H atoms in magnetically trappable states and show that the ratio of elastic to inelastic cross sections remains high across a wide range of temperatures and magnetic fields. For F atoms initially in the spin-stretched state ( 2 P 3/2 , f = m f = +2), sympathetic cooling appears likely to succeed from starting temperatures around 1 K or even higher. This occurs because inelastic collisions are suppressed by p-wave and d-wave barriers that are 600 mK and 3.2 K high, respectively. In combination with recent results on H + NH and H + OH collisions [M. L. González-Martínez and J. M. Hutson, Phys. Rev. Lett. 111, 203004 (2013)], this establishes ultracold H atoms as a very promising and versatile coolant for atoms and molecules that cannot be laser-cooled.

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“…Such magneto-association is hard or even impossible for a vast class of atomic systems of interest, for instance combinations of an alkali metal and an alkaline-earth metal or pairs of alkaline-earth metal atoms. The former systems possess only extremely narrow magnetic Feshbach resonances [8,9], the latter none at all.…”

Section: Introductionmentioning

confidence: 99%

Efficient production of long-lived ultracold Sr2 molecules

et al. 2017

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We associate Sr atom pairs on sites of a Mott insulator optically and coherently into weaklybound ground-state molecules, achieving an efficiency above 80%. This efficiency is 2.5 times higher than in our previous work [S. Stellmer, B. Pasquiou, R. Grimm, and F. Schreck, Phys. Rev. Lett. 109, 115302 (2012)] and obtained through two improvements. First, the lifetime of the molecules is increased beyond one minute by using an optical lattice wavelength that is further detuned from molecular transitions. Second, we compensate undesired dynamic light shifts that occur during the stimulated Raman adiabatic passage (STIRAP) used for molecule association. We also characterize and model STIRAP, providing insights into its limitations. Our work shows that significant molecule association efficiencies can be achieved even for atomic species or mixtures that lack Feshbach resonances suitable for magnetoassociation.

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Prospects of forming ultracold molecules in2Σstates by magnetoassociation of alkali-metal atoms with Yb

Cited by 75 publications

References 64 publications

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

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

Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

Efficient production of long-lived ultracold Sr2 molecules

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