Controlling vortex lattice structure of binary Bose-Einstein condensates via disorder-induced vortex pinning
Document Type
Article
Publication Title
Physical Review A
Abstract
We study the vortex pinning effect on the vortex lattice structure of the rotating two-component Bose-Einstein condensates (BECs) in the presence of impurities or disorder by numerically solving the time-dependent coupled Gross-Pitaevskii equations. We investigate the transition of the vortex lattice structures by changing conditions such as angular frequency, the strength of the inter-component interaction and pinning potential, and the lattice constant of the periodic pinning potential. We show that even a single impurity pinning potential can change the unpinned vortex lattice structure from triangular to square or from triangular to a structure which is the overlap of triangular and square. In the presence of a periodic pinning potential or optical lattice, we observe the structural transition from the unpinned vortex lattice to the pinned vortex lattice structure of the optical lattice. In the presence of a random pinning potential or disorder, the vortex lattice melts following a two-step process by creation of lattice defects, dislocations, and disclinations, with the increase of rotational frequency, similar to that observed for single-component Bose-Einstein condensates. However, for the binary BECs, we show that the two-step vortex lattice melting also occurs with increasing strength of the intercomponent interaction.
DOI
10.1103/PhysRevA.109.063333
Publication Date
6-1-2024
Recommended Citation
Kuiri, Dibyendu; Mithun, Thudiyangal; and Dey, Bishwajyoti, "Controlling vortex lattice structure of binary Bose-Einstein condensates via disorder-induced vortex pinning" (2024). Open Access archive. 10354.
https://impressions.manipal.edu/open-access-archive/10354
