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.Comment: 7 pages, 6 figure
