By considering symmetric- and asymmetric-dipolar coupled mixtures
(with dysprosium and erbium isotopes), we report a study on relevant
anisotropic effects, related to spatial separation and miscibility, due
to dipole-dipole interactions (DDIs) in rotating binary dipolar
Bose-Einstein condensates. The binary mixtures are kept in strong
pancake-like traps, with repulsive two-body interactions modeled by an
effective two-dimensional (2D) coupled Gross-Pitaevskii equation. The
DDI are tuned from repulsive to attractive by varying the dipole
polarization angle. A clear spatial separation is verified in the
densities for attractive DDIs, being angular for symmetric mixtures and
radial for asymmetric ones. Also relevant is the mass-imbalance
sensibility observed by the vortex-patterns in symmetric- and
asymmetric-dipolar mixtures. In an extension of this study, here we show
how the rotational properties and spatial separation of these dipolar
mixture are affected by a quartic term added to the harmonic trap of one
of the components.
Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions