Bose-Einstein condensation of optically trapped cesium

Weber, T.; Herbig, Jens; Mark, Manfred J.; Nägerl, Hanns‐Christoph; Grimm, Rudolf

doi:10.1109/qels.2003.238276

Cited by 28 publications

(38 citation statements)

References 99 publications

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“…We evaporatively cool the atoms in the optical trap at a magnetic field of 27 G [24], where the two-body scattering length is large enough (a ≈ 450a 0 , with a 0 the Bohr radius) to provide fast thermalization. During the evaporation sequence, an extra magnetic field gradient is applied to levitate the atoms against the gravity [27,28]. We typically obtain a nearly-degenerate sample of 8000 Cs atoms at T = 100 nK.…”

Section: Binding Energy Measurements and Determination Of The Scmentioning

confidence: 99%

Determination of atomic scattering lengths from measurements of molecular binding energies near Feshbach resonances

et al. 2009

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We present an analytic model to calculate the atomic scattering length near a Feshbach resonance from data on the molecular binding energy. Our approach considers finite-range square-well potentials and can be applied near broad, narrow, or even overlapping Feshbach resonances. We test our model on Cs2 Feshbach molecules. We measure the binding energy using magnetic-field modulation spectroscopy in a range where one broad and two narrow Feshbach resonances overlap. From the data we accurately determine the Cs atomic scattering length and the positions and widths of two particular resonances.

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Section: Binding Energy Measurements and Determination Of The Scmentioning

confidence: 99%

Determination of atomic scattering lengths from measurements of molecular binding energies near Feshbach resonances

et al. 2009

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“…Our measurements are conducted in a nearly isotropic optical dipole trap formed by two crossed 100 W CO 2 -laser beams focused to a waist of 600 m [16]. A vertical magnetic field gradient of 31 G=cm cancels gravity for the 6 2 S 1=2 , F 3, m F 3 absolute ground state of Cs.…”

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Three-Body Recombination at Large Scattering Lengths in an Ultracold Atomic Gas

et al. 2003

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We study three-body recombination in an optically trapped ultracold gas of cesium atoms with precise magnetic control of the s-wave scattering length a. At large positive values of a, we measure the dependence of the rate coefficient on a and confirm the theoretically predicted scaling proportional to a(4). Evidence of recombination heating indicates the formation of very weakly bound molecules in the last bound energy level.

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“…We apply a magnetic field of 20 G, slightly above the Feshbach resonance, and a magnetic field gradient of 31 G=cm to levitate the atoms [15]. The CO 2 -laser trap is roughly spherically symmetric with a trapping frequency of !…”

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Observation of Feshbach-Like Resonances in Collisions between Ultracold Molecules

et al. 2005

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We observe magnetically tuned collision resonances for ultracold Cs2 molecules stored in a CO2-laser trap. By magnetically levitating the molecules against gravity, we precisely measure their magnetic moment. We find an avoided level crossing which allows us to transfer the molecules into another state. In the new state, two Feshbach-like collision resonances show up as strong inelastic loss features. We interpret these resonances as being induced by Cs4 bound states near the molecular scattering continuum. The tunability of the interactions between molecules opens up novel applications such as controlled chemical reactions and synthesis of ultracold complex molecules.

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Bose-Einstein condensation of optically trapped cesium

Cited by 28 publications

References 99 publications

Determination of atomic scattering lengths from measurements of molecular binding energies near Feshbach resonances

Determination of atomic scattering lengths from measurements of molecular binding energies near Feshbach resonances

Three-Body Recombination at Large Scattering Lengths in an Ultracold Atomic Gas

Observation of Feshbach-Like Resonances in Collisions between Ultracold Molecules

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