Mixture of ultracold lithium and cesium atoms in an optical dipole trap

Mosk, Allard; Kraft, Stephan; Mudrich, M.; Singer, Kilian; Wohlleben, Wendel; Grimm, Rudolf; Weidemüller, Matthias

doi:10.1007/s003400100743

Cited by 88 publications

(95 citation statements)

References 25 publications

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“…From a calculation of the static polarizability of LiCs molecules in X 1 Σ + ,v ′′ =0 [39] and previous results obtained with this setup [40], we expect a trap depth on the order of 600µK for the ground state molecules in v ′′ =0. The calculation shows, that the trap depth increases for higher vibrational levels, so that all produced ground state molecules are expected to be trapped.…”

Section: Calculated Probabilities For Decay Into the Xsupporting

confidence: 56%

Formation of ultracold dipolar molecules in the lowest vibrational levels by photoassociation

et al. 2009

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We recently reported the formation of ultracold LiCs molecules in the rovibrational ground state et al., PRL 101, 133004 (2008)]. Here we discuss details of the experimental setup and present a thorough analysis of the photoassociation step including the photoassociation line shape. We predict the distribution of produced ground state molecules using accurate potential energy curves combined with an ab-initio dipole transition moment and compare this prediction with experimental ionization spectra. Additionally we improve the value of the dissociation energy for the X 1 Σ + state by high resolution spectroscopy of the vibrational ground state.

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Section: Calculated Probabilities For Decay Into the Xsupporting

confidence: 56%

Formation of ultracold dipolar molecules in the lowest vibrational levels by photoassociation

et al. 2009

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“…We expand upon the usual treatment [41,42,56,57] by including terms for evaporation [58] and single-species three-body recombination [59] as described in the Appendix. The coupled equations for the number N i and temperature T i of the two species arė…”

Section: Rate Equations For Thermalizationmentioning

confidence: 99%

“…The average energy transfer in a hard-sphere collision is [56] ∆E Cs→Yb = ξk B ∆T, (A.11) where ∆T = T Cs − T Yb and ξ = 4m Cs m Yb (m Cs + m Yb ) 2 (A.12) reduces the energy transfer for collisions between atoms of different masses. If the collisions are not classical hardsphere (or purely s-wave) in nature, then different deflection angles Θ should be weighted by a factor of 1 − cos Θ [70,71] and the average energy transferred per collision varies from Eq.…”

Section: Appendix: Modeling Thermalizationmentioning

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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“…(15) From the measured thermalization rate, using the model presented in Ref. [28], the large value for the zeroenergy s-wave scattering length are obtained using conventional double magneto-optical trap (MOT) apparatus [29,30]. G. Modugno, G Ferrari and et.…”

Section: The Convergenge and Calculation Scattering Length And Efmentioning

confidence: 99%

Calculation of Elastic Scattering Properties in Ultracold Fermi–Bose and Bose–Bose Rb–K Vapor

Öztürk

Özçelik

2006

J. Phys. Soc. Jpn.

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The calculation of the elastic scattering properties of mixtures composed by rubidium and potassium atoms is reported and compared with experimental results in detail. The improved potentials for both molecular states the singlet x 1 + g and the triplet a 3 + u of the RbK are presented, and the scattering lengths at and the effective range re are calculated with the help of this potential using WKB and Numerov methods for Rb-K in the triplet and singlet state. In addition, the convergence of these scattering properties as the depending on a K0 parameter is investigated using Quantum Defect Theory. The evaporative cooling other results that include the cross section and the spincharge cross section, the rate coefficient as a function of the energy and the ultra-low temperature are also presented in this study.

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Mixture of ultracold lithium and cesium atoms in an optical dipole trap

Cited by 88 publications

References 25 publications

Formation of ultracold dipolar molecules in the lowest vibrational levels by photoassociation

Formation of ultracold dipolar molecules in the lowest vibrational levels by photoassociation

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

Calculation of Elastic Scattering Properties in Ultracold Fermi–Bose and Bose–Bose Rb–K Vapor

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