All-optical production of a large Bose-Einstein condensate in a double compressible crossed dipole trap

Yamashita, Kiyotaka; Hanasaki, Kota; Ando, Akihiro; Takahama, Masahiro; Kinoshita, Tetsuya

doi:10.1103/physreva.95.013609

Cited by 14 publications

(9 citation statements)

References 30 publications

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“…[59], where = 2 /m Cs (a CsCs −ā) 2 withā = 95.5 a 0 for Cs. We also cannot rule out any heating effects due to the broadband, multi-mode nature of the trapping laser [62][63][64][65] which may inflate the value ofṪ Cs,Heat above the simple estimate of 60 nK/s based upon off-resonant scattering of photons. We find that varying the value of the total trap heating rateṪ Cs,Heat over a large range changes the extracted cross section by less than its error.…”

Section: Analysis Of Resultsmentioning

confidence: 99%

“…The Cs three-body loss coefficient is measured to be K Cs,3 = 1 +1 −0.9 × 10 −26 cm 6 /s at the bias field used in the measurements. In addition to the above terms, T i,ODT is added as an independent heating term to account for any heating from the trapping potential, such as off-resonant photon scattering [61] or additional heating effects due to the multi-mode nature of the trapping laser [62][63][64][65]. The heating rate for Yb alone is found to be zero within experimental error, soṪ Yb,ODT is fixed at 1 nK/s, which is the predicted heating rate due to offresonant photon scattering.…”

Section: Rate Equations For Thermalizationmentioning

confidence: 99%

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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: Analysis Of Resultsmentioning

confidence: 99%

Section: Rate Equations For Thermalizationmentioning

confidence: 99%

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

et al. 2017

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“…[126], where = 2 /m Cs (a CsCs −ā) 2 withā = 95.5 a 0 for Cs. We also cannot rule out any heating effects due to the broadband nature of the trapping laser [275,277,286,287] which may inflate the value ofṪ Cs,Heat above the simple estimate of 60 nK/s based upon off-resonant scattering of photons. We find that varying the value of the total trap heating rateṪ Cs,Heat over a large range changes the extracted cross section by less than its error.…”

Section: Measuring the Elastic Cross Sectionmentioning

confidence: 87%

“…The Cs three-body loss coefficient is measured to be K Cs,3 = 1 +1 −0.9 × 10 −26 cm 6 /s at the bias field used in the measurements. In addition to the above terms,Ṫ i,dimple is added as an independent heating term to account for any heating from the trapping potential, such as off-resonant photon scattering 1 or additional heating effects due to the broadband nature of the trapping laser [275,277,286,287]. The heating rate for Yb alone is found to be zero within experimental error, soṪ Yb,dimple is fixed at 1 nK/s, which is the predicted heating rate due to off-resonant photon scattering.…”

Section: Interspecies Interactionsmentioning

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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“…One way to achieve that is to use atomic Bose-Einstein condensates (BEC) 26 . The fastest and easiest way to produce an atomic BEC is an all-optical method of condensation 27,28 , where thermal atoms are evaporatively cooled in an optical dipole trap. Such a BEC can be prepared in a free space next to the atom chip in a superposition of a standard magneto-optical trap (MOT) and an optical dipole trap.…”

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confidence: 99%

A perspective on integrated atomo-photonic waveguide circuits

Ovchinnikov

2021

Preprint

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Integrated photonic circuits based on suspended photonic rib waveguides, which can be used for coherent trapping, guiding, and splitting of ultra-cold neutral atoms in two-colour evanescent light fields near their surfaces, are described. Configurations of quantum inertial sensors based on such integrated atomo-photonic waveguides, which are simultaneously guiding photons and atoms along the same paths, are presented. The difference between free-space and guided atom interferometers in the presence of external forces is explained. The theoretical and technological challenges, to be overcome on the way to the realization of such a novel platform for quantum technologies, are discussed.

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All-optical production of a large Bose-Einstein condensate in a double compressible crossed dipole trap

Cited by 14 publications

References 30 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

Photoassociation of Ultracold CsYb Molecules and Determination of Interspecies Scattering Lengths

A perspective on integrated atomo-photonic waveguide circuits

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