Roton-Maxon Spectrum and Stability of Trapped Dipolar Bose-Einstein Condensates
L. SantosInstitut für Theoretische Physik, Universität Hannover, D-30167 Hannover, GermanyG. V. ShlyapnikovFOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The NetherlandsMaciej LewensteinInstitut für Theoretische Physik, Universität Hannover, D-30167 Hannover, Germany
2003en
ABI
Abstract
We find that pancake dipolar condensates can exhibit a roton-maxon character of the excitation spectrum, so far observed only 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.
Identifiers
Citations and references
Cited by 20 references