Radial and angular rotons in trapped dipolar gases
arXiv:cond-mat/0607704 · doi:10.1103/PhysRevLett.98.030406
Abstract
We study Bose-Einstein condensates with purely dipolar interactions in oblate (pancake) traps. We find that the condensate always becomes unstable to collapse when the number of particles is sufficiently large. We analyze the instability, and find that it is the trapped-gas analogue of the ``roton-maxon'' instability previously reported for a gas that is unconfined in two dimensions. In addition, we find that under certain circumstances, the condensate wave function attains a biconcave shape, with its maximum density away from the center of the gas. These biconcave condensates become unstable due to azimuthl excitation - an angular roton.
4 pages, 3 figures
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Cited by in corpus (24)
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- Symmetry Breaking and Self-trapping of a Dipolar Bose-Einstein Condensate in a Double-well Potential
- Structure formation during the collapse of a dipolar atomic Bose-Einstein condensate
- Ground-state structure and stability of dipolar condensates in anisotropic traps
- Vortices in dipolar condensates with dominant dipolar interactions
- Coherent collapse of a dipolar Bose-Einstein condensate for different trap geometries
- Super-Tonks-Girardeau regime in trapped one-dimensional dipolar gases
- Thomas-Fermi versus one- and two-dimensional regimes of a trapped dipolar Bose-Einstein condensate
- Collisional Control of Ground State Polar Molecules and Universal Dipolar Scattering
- Pseudo-potential treatment of two aligned dipoles under external harmonic confinement
- Dipolar Bose-Einstein condensates at Finite temperature
- Low-energy resonances and bound states of aligned bosonic and fermionic dipoles
- An effective many-body theory for strongly interacting polar molecules
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- The stability and free expansion of a dipolar Fermi gas
- Bifurcations, order, and chaos in the Bose-Einstein condensation of dipolar gases
- Stability of the density-wave state of a dipolar condensate in a pancake trap
- Observing collapse in two colliding dipolar Bose-Einstein condensates