Superfluidity in the absence of kinetics in spin-orbit-coupled optical lattices

Abstract

At low temperatures bosons typically condense to minimize their single-particle kinetic energy while interactions stabilize superfluidity. Optical lattices with artificial spin-orbit coupling challenge this paradigm because here kinetic energy can be quenched in an extreme regime where the single-particle band flattens. To probe the fate of superfluidity in the absence of kinetics we construct and numerically solve interaction-only tight-binding models in flat bands. We find that novel superfluid states arise entirely from interactions operating in quenched kinetic energy bands, thus revealing a distinct and unexpected condensation mechanism. Our results have important implications for the identification of quantum condensed phases of ultracold bosons beyond conventional paradigms.

7 pages, 6 figures

References in corpus (14)

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• Bose condensation in flat bands
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Cited by in corpus (10)

• Two-dimensional dipolar gap solitons in free space with spin-orbit coupling
• Two- and one-dimensional gap solitons in spin-orbit-coupled systems with Zeeman splitting
• Moiré-Bose-Hubbard model for interlayer excitons in twisted transition metal dichalcogenide heterostructures
• Interaction-Enhanced Group Velocity of Bosons in the Flat Band of an Optical Kagome Lattice
• Gap and embedded solitons in microwave-coupled binary condensates
• Superfluidity from correlations in driven boson systems
• Transfer of solitons and half-vortex solitons via adiabatic passage
• Collective Oscillations of Bose-Einstein Condensates in a Synthetic Magnetic Field
• Band-edge superfluid of Bose-Einstein condensates in the spin-orbit-coupled Zeeman lattice
• Half-vortex soliton lattices in spin-orbit-coupled Bose-Einstein condensates with a quasi-flat band