Bose-Einstein condensation in a stiff TOP trap with adjustable geometry
(2000)
Observation of harmonic generation and nonlinear coupling in the collective dynamics of a Bose condensate
(2000)
Observation of the scissors mode and evidence for superfluidity of a trapped bose-einstein condensed Gas.
Phys Rev Lett 84:10 (2000) 2056-2059
Abstract:
We report the observation of the scissors mode of a Bose-Einstein condensed gas of 87Rb atoms in a magnetic trap, which gives direct evidence of superfluidity in this system. The scissors mode of oscillation is excited by a sudden rotation of the anisotropic trapping potential. For a gas above T(c) (normal fluid) we detect the occurrence of oscillations at two frequencies, with the lower frequency corresponding to the rigid body value of the moment of inertia. Well below T(c) the condensate oscillates at a single frequency, without damping, as expected for a superfluid.Measurement of elastic cross section for cold cesium collisions
Physical Review A - Atomic, Molecular, and Optical Physics 61:3 (2000) 327071-327074
Abstract:
We have measured the time taken for a magnetically trapped cloud of cold cesium atoms in the (F =3,mF=-3) ground state to rethermalize from a nonequilibrium spatial and velocity distribution. From these measurements we infer the dependences of the elastic scattering cross section on temperature and magnetic field in the ranges 1 - 30 μΚ and 0.05-2.0 mT, respectively. We determine a lower bound on the magnitude of the (3,-3) + (3,-3) s-wave scattering length of 940a0.Scissors mode and superfluidity of a trapped Bose-Einstein condensed gas
(2000) 285-289