Superfluidity in the Absence of Kinetics in Spin-Orbit-Coupled Optical Lattices

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Amer Physical Soc

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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 flatbands. We find that 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.

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Gases, Atoms, Bosons, Optics, Superfluidity

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AFOSR (FA9550-15-1-0445); ARO (W911NF-16-1-0182); ARO (W911NF-12-1-0334) and the NSF (PHY-1505496).

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©2017 American Physical Society

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