Roton-maxon spectrum and stability of trapped dipolar condensates
arXiv:cond-mat/0301474 · doi:10.1103/PhysRevLett.90.250403
Abstract
We find that pancake dipolar condensates can exhibit a roton-maxon character of the excitation spectrum, so far only observed in superfluid helium. We also obtain a condition for the dynamical stability of these condensates. The spectrum and the border of instability are tunable by varying the particle density and/or the confining potential. This opens wide possibilities for manipulating the superfluid properties of dipolar condensates.
4 pages, 2 ps figures