Vortex lattice transitions in cyclic spinor condensates.

Vortex molecules in spinor condensates

Condensates of atoms with spins can have vortices of several types; these are related to the symmetry group of the atoms’ ground state. We discuss how, when a condensate is placed in a small magnetic field that breaks the spin symmetry, these vortices may form bound states. Using symmetry classification of vortex charge and rough estimates for vortex interactions, one can show that some configu...

Topological Defects in Ferromagnetic, Antiferromagnetic and Cyclic Spinor Condensates – A Homotopy Theory

We apply the homotopy group theory in classifying the topological defects in atomic spin-1 and spin-2 Bose-Einstein condensates. The nature of the defects depends crucially on the spin-spin interaction between the atoms. We find the topologically stable defects both for spin-1 ferromagnetic and anti-ferromagnetic states, and for spin-2 ferromagnetic and cyclic states. With this rigorous approac...

Vortex-lattice dynamics in rotating spinor Bose-Einstein condensates.

We observe interlaced square vortex lattices in rotating dilute-gas spinor Bose-Einstein condensates (BEC). After preparing a hexagonal vortex lattice in a one-component BEC in an internal atomic state |1, we coherently transfer a fraction of the superfluid to a different state |2. The subsequent evolution of this pseudo-spin-1/2 superfluid towards a state of offset square lattices involves an ...

Vortex-splitting and phase-separating instabilities of coreless vortices in F=1 spinor Bose-Einstein condensates

Vortex lattices in Bose-Einstein condensates with Dipolar Interactions Beyond the Weak Interaction Limit

We study the ground states of rotating atomic Bose-Einstein condensates with dipolar interactions. We present the results of numerical studies on a periodic geometry which show vortex lattice ground states of various symmetries: triangular and square vortex lattices, “stripe crystal” and “bubble crystal”. We present the phase diagram (for systems with a large number of vortices) as a function o...