Interaction-induced excited-band condensate in a double-well optical lattice

Abstract

We show theoretically that interaction effects in a double-well optical lattice can induce condensates in an excited band. For a symmetric double-well lattice, bosons condense into the bottom of the excited band at the edge of the Brillouin Zone if the chemical potential is above a critical value. For an asymmetric lattice, a condensate with zero momentum is automatically induced in the excited band by the condensate in the lowest band. This is due to a combined effect of interaction and lattice potential, which reduces the band gap and breaks the inversion symmetry. Our work can be generalized to a superlattice composed of multiple-well potentials at each lattice site, where condensates can be induced in even higher bands.

4pages, 3 figures

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• Dynamics in asymmetric double-well condensates
• Tunneling-Induced Restoration of the Degeneracy and the Time-Reversal Symmetry Breaking in Optical Lattices
• Multimode model for an atomic Bose-Einstein condensate in a ring-shaped optical lattice
• Loop Structure Stability of a Double-Well-Lattice BEC
• Coherent Atom Transport via Enhanced Shortcuts to Adiabaticity: Double-Well Optical Lattice
• Dynamics in multiple-well Bose-Einstein condensates
• Effective two-mode model in Bose-Einstein condensates versus Gross-Pitaevskii simulations
• Blocked populations in ring-shaped optical lattices
• Symmetry-enriched Bose-Einstein condensates in spin-orbit coupled bilayer system
• Mott insulating phases and magnetism of fermions in a double-well optical lattice
• Bose-Einstein condensation in a frustrated triangular optical lattice