Vortex lattices in binary Bose-Einstein condensates with dipole-dipole interactions

Kumar, Ramavarmaraja Kishor; Tomio, Lauro [UNESP]; Malomed, Boris A.; Gammal, Arnaldo

Vortex lattices in binary Bose-Einstein condensates with dipole-dipole interactions

Arquivos

WOS000418910400011.pdf (1.87 MB)

Data

2017-12-29

Autores

Kumar, Ramavarmaraja Kishor

Tomio, Lauro

Malomed, Boris A.

Gammal, Arnaldo

Editor

Amer Physical Soc

Tipo

Artigo

Direito de acesso

Acesso aberto

Resumo

We study the structure and stability of vortex lattices in two-component rotating Bose-Einstein condensates with intrinsic dipole-dipole interactions and contact interactions. To address experimentally accessible coupled systems, we consider Dy-164-Dy-162 and Er-168-Dy-164 mixtures, which feature different miscibilities. The corresponding dipole moments are mu(Dy) = 10 mu(B) and mu(Er) = 7 mu(B), where mu(B) is the Bohr magneton. For comparison we also discuss a case where one of the species is nondipolar. Under a large aspect ratio of the trap, we consider mixtures in the pancake-shaped format, which are modeled by effective two-dimensional coupled Gross-Pitaevskii equations, with a fixed polarization of the magnetic dipoles. Then, the miscibility and vortex-lattice structures are studied by varying the coefficients of the contact interactions (assuming the use of the Feshbach-resonance mechanism) and the rotation frequency. We present phase diagrams for several types of lattices in the parameter plane of the rotation frequency and the ratio of inter-and intraspecies scattering lengths. The vortex structures are found to be diverse for the more miscible Dy-164-Dy-162 composition, with a variety of shapes, whereas for the less miscible case of Er-168-Dy-164, the lattice patterns mainly feature circular or square formats.