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

TL;DR

This paper introduces two innovative methods using time-averaged adiabatic potentials to efficiently cool and rotate Bose-Einstein condensates, demonstrating versatile control over cold atom systems with straightforward magnetic field adjustments.

Contribution

The study presents new techniques for cooling and imparting angular momentum to Bose-Einstein condensates using TAAPs, enhancing control and efficiency over existing methods.

Findings

Achieved quantum degeneracy via intrinsic loss channel of TAAP.

Successfully imparted angular momentum, creating vortex lattices.

Demonstrated straightforward magnetic field adjustments for control.

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.