Solitons in an atomic 2D gas: an illustration of scale invariance - Dalibard, J.; Bakkali-Hassani, B.; Maury, C.; Zou, Y.-Q.; Le Cerf, E.; Saint-Jalm, R.; Castilho, Patricia Christina Marques; Nascimbene, S.; Beugnon, J. (Quantum Optics, 2021)