Hysteresis in quantized vortex shedding
  It is shown using numerical simulations that flow patterns around an obstacle potential moving in a superfluid exhibit hysteresis. In a certain velocity region, there is a bistability between stationary laminar flow and periodic vortex shedding. The bistability exists in two and three dimensional systems. 
Tsuyoshi Kadokura, Jun Yoshida, and Hiroki Saito
cond-mat.quant-gas