Stability Spectroscopy of Rotons in a Dipolar Bose Gas
arXiv:1301.1991 · doi:10.1103/PhysRevA.87.051605
Abstract
We study the stability of a quasi-one-dimensional dipolar Bose-Einstein condensate (dBEC) that is perturbed by a weak lattice potential along its axis. Our numerical simulations demonstrate that systems exhibiting a roton-maxon structure destabilize readily when the lattice wavelength equals either half the roton wavelength or a low roton subharmonic. We apply perturbation theory to the Gross-Pitaevskii and Bogoliubov de Gennes equations to illustrate the mechanisms behind the instability threshold. The features of our stability diagram may be used as a direct measurement of the roton wavelength for quasi-one-dimensional geometries.
5 pages, 3 figures
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- The Fate of the Higgs Mode in a Trapped Dipolar Supersolid
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- Roton confinement in trapped dipolar Bose-Einstein condensates
- Roton excitations in a trapped dipolar Bose-Einstein condensate
- Variational theory for the ground state and collective excitations of an elongated dipolar condensate
- Nonequilibrium dynamics of an ultracold dipolar gas
- Geometric Stability Spectra of Dipolar Bose Gases in Tunable Optical Lattices
- Time-of-Flight Roton Spectroscopy in Dipolar Bose-Einstein Condensates
- Thermally activated local collapse of a flattened dipolar condensate
- Static-response theory and the roton-maxon spectrum of a flattened dipolar Bose-Einstein condensate
- Roton in a few-body dipolar system
- Finite resolution fluctuation measurements of a trapped Bose-Einstein condensate
- Anisotropic merging and splitting of dipolar Bose-Einstein condensates