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Turbulent flow restricted to two dimensions can spontaneously develop orderon large scales, defying entropy expectations and in sharp contrast withturbulence in three dimensions where nonlinear turbulent processes act todestroy large-scale order. In this work we report the observation of unusualturbulent behavior in steady-state flow of superfluid \4He---a liquid withvanishing viscosity and discrete vorticity---in a nearly two-dimensionalchannel. Surprisingly, for a range of experimental parameters, turbulence isobserved to exist in two bistable states. This bistability can be wellexplained by the appearance of large-scale regions of flow of oppositevorticity.

Observation of bistable turbulence in quasi-two-dimensional superflow