Scattering lengths of calcium and barium isotopes

Dammalapati, U.; Willmann, Lorenz; Knoop, Steven

doi:10.1103/physreva.84.054703

Cited by 7 publications

(14 citation statements)

References 41 publications

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“…These limitations reduce the number of possible binary mixtures considerably. In particular, all combination of bosonic Ca isotopes seem unfavorable, since all intraspecies scattering lengths of the most abundant Ca isotopes are quite large [44,78].…”

Section: Double-degenerate Bose-bose Mixtures Of Srmentioning

confidence: 99%

Production of quantum-degenerate strontium gases

2013

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We report on an improved scheme to generate Bose-Einstein condensates (BECs) and degenerate Fermi gases of strontium. This scheme allows us to create quantum gases with higher atom number, a shorter time of the experimental cycle, or deeper quantum degeneracy than before. We create a BEC of 84 Sr exceeding 10 7 atoms, which is a 30-fold improvement over previously reported experiments. We increase the atom number of 86 Sr BECs to 2.5 × 10 4 (a fivefold improvement), and refine the generation of attractively interacting 88 Sr BECs. We present a scheme to generate 84 Sr BECs with a cycle time of 2 s, which, to the best of our knowledge, is the shortest cycle time of BEC experiments ever reported. We create deeply-degenerate 87 Sr Fermi gases with T /TF as low as 0.10(1), where the number of populated nuclear spin states can be set to any value between one and ten. Furthermore, we report on a total of five different double-degenerate Bose-Bose and Bose-Fermi mixtures. These studies prepare an excellent starting point for applications of strontium quantum gases anticipated in the near future. PACS numbers: 67.85.-d, 67.85.Fg, 67.85.Lm, 67.85.Pq 2 1 2 3 J J

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Section: Double-degenerate Bose-bose Mixtures Of Srmentioning

confidence: 99%

Production of quantum-degenerate strontium gases

2013

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“…Some isotopes of alkaline-earth atoms feature large positive scattering lengths, such as 40 Ca, 42 Ca, 44 Ca [165], and 86 Sr. While scattering between atoms provides thermalization during evaporation, there is a downside of a very large scattering length a: Inelastic three-body losses have an upper limit proportional to a 4 [133,134], and can reduce the evaporation efficiency drastically.…”

Section: B Bose-einstein Condensation Of 86 Srmentioning

confidence: 99%

Degenerate Quantum Gases of Strontium

Stellmer¹,

Tey²,

Parigger³

et al. 2014

Annual Review of Cold Atoms and Molecules

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Degenerate quantum gases of alkaline-earth-like elements open new opportunities in research areas ranging from molecular physics to the study of strongly correlated systems. These experiments exploit the rich electronic structure of these elements, which is markedly different from the one of other species for which quantum degeneracy has been attained. Specifically, alkaline-earth-like atoms, such as strontium, feature metastable triplet states, narrow intercombination lines, and a nonmagnetic, closed-shell ground state. This review covers the creation of quantum degenerate gases of strontium and the first experiments performed with this new system. It focuses on laser-cooling and evaporation schemes, which enable the creation of Bose-Einstein condensates and degenerate Fermi gases of all strontium isotopes, and shows how they are used for the investigation of optical Feshbach resonances, the study of degenerate gases loaded into an optical lattice, as well as the coherent creation of Sr2 molecules.

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“…Furthermore, the bosonic isotopes have zero nuclear spin and two-body loss processes are completely absent. An interesting example is Ca, for which potential resonances show up for all the bosonic isotopes [41]. In the following we will discuss two isotopes of Sr and Yb, for which a is accurately known, a r vdW , and the first three-body loss measurements in BECs have already been reported.…”

Section: Other Systemsmentioning

confidence: 99%

“…Signatures of Efimov states are imprinted on trap loss caused by three-body recombination, which typically determines the lifetime of an ultracold trapped atomic gas or Bose-Einstein condensate. So 6 Li [12][13][14], and the Bose-Bose mixture 41 K + 87 Rb [15]. In addition to the scattering length, a three-body parameter (3BP) is needed to fully describe the spectrum of Efimov trimers.…”

Section: Introductionmentioning

confidence: 99%

Universal three-body parameter in ultracold4He*

et al. 2012

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We have analyzed our recently measured three-body loss rate coefficient for a Bose-Einstein condensate of spin-polarized metastable triplet 4 He atoms in terms of Efimov physics. The large value of the scattering length for these atoms, which provides access to the Efimov regime, arises from a nearby potential resonance. We find the loss coefficient to be consistent with the three-body parameter (3BP) found in alkali-metal experiments, where Feshbach resonances are used to tune the interaction. This provides evidence for a universal 3BP outside the group of alkali-metal elements. In addition, we give examples of other atomic systems without Feshbach resonances but with a large scattering length that would be interesting to analyze once precise measurements of three-body loss are available.

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Scattering lengths of calcium and barium isotopes

Cited by 7 publications

References 41 publications

Production of quantum-degenerate strontium gases

Production of quantum-degenerate strontium gases

Degenerate Quantum Gases of Strontium

Universal three-body parameter in ultracold4He*

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