Quantum dynamics of Raman-coupled Bose-Einstein condensates using Laguerre-Gaussian beams

Details Quantum dynamics of Raman-coupled Bose-Einstein condensates using Laguerre-Gaussian beams Quantum dynamics of Raman-coupled Bose-Einstein condensates using Laguerre-Gaussian beams

2007-02-27

arxiv.org/abs/cond-mat/0702649v2

Phys. Rev. A 75, 063623 (2007)

Physics

Condensed Matter

Other Condensed Matter

10 pages, 6 figures

Scientific paper

10.1103/PhysRevA.75.063623

We investigate the quantum dynamics of Raman-coupled Bose-Einstein condensates driven by laser beams that carry orbital angular momentum. By adiabatically eliminating the excited atomic state we obtain an effective two-state Hamiltonian for the coupled condensates, and quantization of the matter-wave fields results in collapse and revivals in the quantum dynamics. We show that the revival period depends on whether the initial nonrotating condensate displays broken U(1) symmetry or not, and that the difference may be detected by measuring the motion of quantized vortices that are nested in the density profile of the Raman-coupled condensates. We further study the steady-state population transfer using a linear sweep of the two-photon detuning, by which the atomic population is coherently transferred from an initial nonrotating state to the final vortex state.

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