Dipolar Bose gas in highly anharmonic traps
arXiv:1401.2261 · doi:10.1103/PhysRevA.89.023617
Abstract
By means of mean-field theory, we have studied the structure and excitation spectrum of a purely dipolar Bose gas in pancake-shaped trap where the confinement in the x-y plane is provided by a highly anharmonic potential resulting in an almost uniform confinement in the plane. We show that the stable condensates is characterized by marked radially structured density profiles. The stability diagram is calculated by independently varying the strength of the interaction and the trap geometry. By computing the Bogoliubov excitation spectrum near the instability line we show that soft "angular" rotons are responsible for the collapse of the system. The free expansion of the cloud after the trap is released is also studied by means of time-dependent calculations, showing that a prolate, cigar-shaped condensate is dynamically stabilized during the expansion, which would otherwise collapse. Dipolar condensates rotating with sufficiently high angular velocity show the formation of multiply-quantized giant vortices, while the condensates acquire a ring-shaped form.
9 pages, 10 figures. Submitted to Phys. Rev. A
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Cited by in corpus (4)
- Two-dimensional Bose gas of tilted dipoles: roton instability and condensate depletion
- Enhanced many-body effects in the excitation spectrum of a weakly-interacting rotating Bose-Einstein condensate
- Many-body effects in the excitations and dynamics of trapped Bose-Einstein condensates
- Characterization of the energy level-structure of a trapped dipolar Bose gas via mean-field parametric resonances