Noise-induced bistability at the T-I–T-II transition in superfluid He II

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Abstract
We present preliminary experiments which indicate a dramatic effect of external noise on superfluid turbulence in thermal counterflow. This turbulent system is in many ways ideal for the study of noise-driven nonlinear dynamical systems. It contains a well-defined continuous transition (the T-I–T-II transition), and noise can be easily imposed on the driving heat current. Previous work has shown that the superfluid turbulence system is described by a single nonlinear amplitude equation, and it can be expected to show some of the rich noise-induced behavior found in theoretical treatments of such systems. We find that external noise dramatically modifies the T-I–T-II transition and induces bistability.

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