arXiv subjects

H. Pu

Publications and source records attributed to H. Pu.

21 records · Page 2Linked to original sources

arXiv2000

Eliminating the mean-field shift in multicomponent Bose-Einstein condensates

We demonstrate that the nonlinear mean-field shift in a multi-component Bose-Einstein condensate may be eliminated by controlling the two-body interaction coefficients. This modification is achieved by, e.g., suitably engineering the environment of the condensate. We consider as an example the case of a two-component condensate in a tightly confining atom waveguide. Modification of the atom-atom interactions is then achieved by varying independently the transverse wave function of the two components. Eliminating the density dependent phase shift in a high-density atomic beam has important applications in atom interferometry and precision measurement.

cond-mat↗

arXiv1998

Coherent disintegration and stability of vortices in trapped Bose condensate

We consider the intrinsic stability of the vortex states of a pure Bose-Einstein condensate confined in a harmonic potential under the effects of coherent atom-atom interaction. We find that stable vortices can be supported, and that vortex stability can be controlled by changing the inter-particle interaction strength. At unstable regimes, a vortex will spontaneously disintegrate into states with different angular momenta even without external perturbations, with the lifetime determined by its imaginary excitation frequencies.

cond-mat.stat-mech↗

arXiv1998

Quantum spins mixing in spinor Bose-Einstein condensates

We examine the internal structure of the ground states of a trapped Bose-Einstein condensate in which atoms have three internal hyperfine spins. We determine a set of collective spin states which minimize the interaction energy between condensate atoms. We also examine the internal dynamics of an initially spin polarized condensate. The time scale of spin-mixing is predicted.

cond-mat.soft↗