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

Abstract

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.

The first two authors contributed equally to this work

References in corpus (2)

• Matter-wave interferometry in a double well on an atom chip
• Trapping and cooling of rf-dressed atoms in a quadrupole magnetic field

Cited by in corpus (11)

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• Controllable Asymmetric Matter-wave Beam Splitter and Ring Potential on an Atom Chip
• A toroidal trap for cold ${}^{87}Rb$ atoms using an rf-dressed quadrupole trap
• Probing multiple-frequency atom-photon interactions with ultracold atoms
• RF dressed atoms beyond the linear Zeeman effect
• Rotational properties of non-dipolar and dipolar Bose-Einstein condensates confined in annular potentials
• Different atom trapping geometries with time averaged adiabatic potentials