Signatures of self-organized criticality in an ultracold atomic gas.

Self-organized criticality is an elegant explanation of how complex structures emerge and persist throughout nature1 , and why such structures often exhibit similar scale-invariant properties2-9 . Although self-organized criticality is sometimes captured by simple models that feature a critical point as an attractor for the dynamics10-15 , the connection to real-world systems is exceptionally hard to test quantitatively16-21 . Here we observe three key signatures of self-organized criticality in the dynamics of a driven-dissipative gas of ultracold potassium atoms: self-organization to a stationary state that is largely independent of the initial conditions; scale-invariance of the final density characterized by a unique scaling function; and large fluctuations of the number of excited atoms (avalanches) obeying a characteristic power-law distribution. This work establishes a well-controlled platform for investigating self-organization phenomena and non-equilibrium criticality, with experimental access to the underlying microscopic details of the system.