Control of the vortex lattice formation in coupled atom-molecular Bose-Einstein condensate in a double well potential: Role of atom-molecule coupling, trap rotation frequency and detuning

Abstract

We study the vortex formation in coupled atomic and molecular condensates in a rotating double well trap by numerically solving the coupled Gross-Pitaevskii like equations. Starting with the atomic condensate in the double well potential we considered two-photon Raman photoassociation for coherent conversion of atoms to molecules. It is shown that the competition between atom-molecule coupling strength and repulsive atom-molecule interaction controls the spacings between atomic and molecular vortices and the rotation frequency of the trap is the key player for controlling the number of visible atomic and molecular vortices. Whereas the Raman detuning controls the spacing between atomic and molecular vortices as well as the number of atomic and molecular vortices in the trap. We have shown by considering the molecular lattices the distance between two molecular vortices can be controlled by varying the Raman detuning. In addition we have found that the Feynman rule relating the total number of vortices and average angular momentum both for atoms and molecules can be satisfied by considering the atomic and molecular vortices those are hidden in density distribution and seen as singularities in phase distribution of the coupled system except for the lattice structure where molecular vortices are overlapped with each other. It is found that although the number of visible/core vortices in atomic and molecular vortex lattices depends significantly on the system parameters the number of atomic and molecular hidden vortices remains constant in most of the cases.

References in corpus (18)

• Vortex formation in a stirred Bose-Einstein condensate
• Direct Observation of Tunneling and Nonlinear Self-Trapping in a single Bosonic Josephson Junction
• Non-equilibrium coherence dynamics in one-dimensional Bose gases
• Squeezing and entanglement in a Bose-Einstein condensate
• Atom--Molecule Coherence in a Bose-Einstein Condensate
• Quantum Gas of Deeply Bound Ground State Molecules
• Superchemistry: dynamics of coupled atomic and molecular Bose-Einstein condensates
• Vortex lattice formation in a rotating Bose-Einstein condensate
• Experimental observation of oscillating and interacting matter wave dark solitons
• Nonlinear dynamics for vortex lattice formation in a rotating Bose-Einstein condensate
• Coherent optical transfer of Feshbach molecules to a lower vibrational state
• Ultracold Molecule Production Via a Resonant Oscillating Magnetic Field
• In situ imaging of vortices in Bose-Einstein condensates
• Pinning of Hidden Vortices in Bose-Einstein Condensate
• Vortex molecules in Bose-Einstein condensates
• Mass-imbalanced Bose-Einstein condensed mixtures in rotating perturbed trap
• Condensates in double-well potential with synthetic gauge potentials and vortex seeding
• Investigation of 3D-Quantized Ring Vortices in Rotating Coupled Atom-Molecular BEC