Interference of atomic levels and superfluid -- Mott insulator phase transition in a two-component Bose-Einstein condensate

Abstract

The superfluid -- Mott insulator phase transition in a Bose-Einstein condensate of neutral atoms with doubly degenerate internal ground states in an optical lattice is theoretically investigated. The optical lattice is created by two counterpropagating linearly polarized laser beams with the angle $\theta$ between the polarization vectors (lin-angle-lin configuration). The phase diagram of the system and the critical values of the parameters are worked out. It is shown that the sign of the detuning plays an important role and that there is a strong suppression of the Mott transition in the case of blue detuning. Varying the laser intensity and/or the angle $\theta$ one can manipulate the Mott-insulator to superfluid quantum phase transition as well as prepare the condensate in physically distinguishable "ferromagnetic" and "antiferromagnetic" superfluid states.

References in corpus (14)

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Cited by in corpus (14)

• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• Non-Abelian gauge potentials for ultra-cold atoms with degenerate dark states
• Ultracold bosons with short-range interaction in regular optical lattices
• Spin-1 bosons with coupled ground states in optical lattices
• The Mott insulator phase of the one dimensional Bose-Hubbard model: a high order perturbative study
• Dynamics of a two-species Bose-Einstein condensate in a double well
• Ground-state energy and depletions for a dilute binary Bose gas
• Bogoliubov speed of sound for a dilute Bose-Einstein condensate in a 3d optical lattice
• Coupled two-component atomic gas in an optical lattice
• Coupling internal atomic states in a two-component Bose-Einstein condensate via an optical lattice: Extended Mott-superfluid transitions
• Correlation and entanglement of two-component Bose-Einstein condensates in a double well
• Phase Coherence and Fragmentation of Two-Component Bose-Einstein Condensates Loaded in State-Dependent Optical Lattices
• Dynamical quantum phase transition of a two-component Bose-Einstein condensate in an optical lattice
• Quantum entanglement of spin-1 bosons with coupled ground states in optical lattices