Trapping ultracold atoms in a time-averaged adiabatic potential

Gildemeister, M.; Nugent, E.; Sherlock, Benjamin E.; Kubasik, M.; Sheard, B T; Foot, C. J.

doi:10.1103/physreva.81.031402

Cited by 35 publications

(41 citation statements)

References 21 publications

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“…This configuration can be implemented in an effectively 2D BEC using a set of attractive (red-detuned) laser sheets and/or blue-detuned repelling sheet pairs [25], or in BEC layers isolated by a strong-standing optical wave [26], that can also be combined with magnetic trapping fields [27]. It is also possible to use the techniques allowing one to "paint" complex potential landscapes (in fact, even more complex than the H-shaped ones that we aim to consider) by rapidly moving laser beams [28], or induce time-averaged adiabatic landscapes created by means of variable magnetic fields [29]. Essentially the same effective potentials can be created in nonlinear optics using properly patterned photonic-crystal media [5] or a transverse trapping structure permanently written in bulk silica [30].…”

Section: Below)mentioning

confidence: 99%

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Symmetric and asymmetric solitons trapped inH-shaped potentials

2011

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We report results of numerical and analytical studies of the spontaneous symmetry breaking in solitons, both two-and one-dimensional (2D and 1D), which are trapped in H-shaped potential profiles built of two parallel potential troughs linked by a narrow rung in the transverse direction. This system can be implemented in self-attractive Bose-Einstein condensates (BECs), as well as in a nonlinear bulk optical waveguide. We demonstrate that the introduction of the transverse link changes the character of the symmetry-breaking bifurcation (SBB) in the system from subcritical to supercritical. (In terms of the corresponding phase transition, it is a change between the first and second kinds.) A noteworthy feature of the SBB in this setting is a nonmonotonous dependence of the soliton's norm at the bifurcation point on the strength of the transverse link. In the full 2D system, the results are obtained in a numerical form. An exact analytical solution is found for the bifurcation in the 1D version of the model, with the transverse rung modeled by the local linear coupling between the parallel troughs with the δ-functional longitudinal profile. By replacing the δ function by its finite-width Gaussian counterpart, similar results are obtained by means of the variational approximation (VA). The VA is also applied to the 1D system with a mixed linear and nonlinear transverse localized coupling. Comparison of the results produced by the different varieties of the system clearly reveals basic features of its the symmetry-breaking transition.

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Section: Below)mentioning

confidence: 99%

“…7, but for the 1D model with the Gaussian profile of the mixed linear-nonlinear coupling, based on Eq (33),. and the variational ansatz(29). The width of the Gaussian profile is y 0 = 0.25 (squares), 0.125 (stars), and 0.05 (balls), respectively.…”

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confidence: 99%

Symmetric and asymmetric solitons trapped inH-shaped potentials

2011

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“…A detailed discussion of the TAAP loading scheme is presented in [18]. Briefly, a typical experimental sequence begins with 5 × 10 6 atoms of 87 Rb at 1 µK confined in the |F = 1,m F = −1 hyperfine state, in an axially symmetric time-averaged orbiting potential (TOP) trap (ω T = 2π × 7 kHz) where B T = 3.2 G and B q = 84 G/cm.…”

Section: Implementation and Resultsmentioning

confidence: 99%

Time-averaged adiabatic ring potential for ultracold atoms

et al. 2011

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We report the experimental realisation of a versatile ring trap for ultracold atoms. The ring geometry is created by the time-averaged adiabatic potential resulting from the application of an oscillating magnetic bias field to a rf dressed quadrupole trap. Lifetimes for a Bose-Einstein condensate in the ring exceed 11s and the ring radius was continuously varied from 50$\mu$m to 261$\mu$m. An efficient method of loading the ring from a conventional TOP trap is presented together with a rotation scheme which introduces angular momentum into the system. The ring presents an opportunity to study the superfluid properties of a condensate in a multiply connected geometry and also has applications for matter-wave interferometry

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“…The positioning of the magnet coil several centimeters from the atoms gives rise to very smooth potentials that allow the preservation of the atomic phase coherence during changes to the confinement. In the first successful trapping of atoms in a TAAP trap reported in [2], cold atoms were loaded into a vertically offset double-well potential which could be adiabatically transformed into an anisotropic shell potential. Building on this work a successful technique was developed to trap atoms in a horizontally orientated, ring-shaped TAAP with a continuously adjustable ring radius [3].…”

Section: Introductionmentioning

confidence: 99%

Techniques to cool and rotate Bose-Einstein condensates in time-averaged adiabatic potentials

2012

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We report two novel techniques for cooling and rotating Bose-Einstein condensates in a dilute rubidium vapour that highlight the control and versatility afforded over cold atom systems by time-averaged adiabatic potentials (TAAPs). The intrinsic loss channel of the TAAP has been successfully employed to evaporatively cool a sample of trapped atoms to quantum degeneracy. The speed and efficiency of this process compares well with that of conventional forced rf-evaporation. In an independent experiment, we imparted angular momentum to a cloud of atoms forming a Bose-Einstein condensate by introducing a rotating elliptical deformation to the TAAP geometry. Triangular lattices of up to 60 vortices were created. All findings reported herein result from straightforward adjustments of the magnetic fields that give rise to the TAAP.

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Trapping ultracold atoms in a time-averaged adiabatic potential

Cited by 35 publications

References 21 publications

Symmetric and asymmetric solitons trapped inH-shaped potentials

Symmetric and asymmetric solitons trapped inH-shaped potentials

Time-averaged adiabatic ring potential for ultracold atoms

Techniques to cool and rotate Bose-Einstein condensates in time-averaged adiabatic potentials

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