From coherent shocklets to giant collective incoherent shock waves in nonlocal turbulent flows

Nature Communications
G XuA Picozzi

Abstract

Understanding turbulent flows arising from random dispersive waves that interact strongly through nonlinearities is a challenging issue in physics. Here we report the observation of a characteristic transition: strengthening the nonlocal character of the nonlinear response drives the system from a fully turbulent regime, featuring a sea of coherent small-scale dispersive shock waves (shocklets) towards the unexpected emergence of a giant collective incoherent shock wave. The front of such global incoherent shock carries most of the stochastic fluctuations and is responsible for a peculiar folding of the local spectrum. Nonlinear optics experiments performed in a solution of graphene nano-flakes clearly highlight this remarkable transition. Our observations shed new light on the role of long-range interactions in strongly nonlinear wave systems operating far from thermodynamic equilibrium, which reveals analogies with, for example, gravitational systems, and establishes a new scenario that can be common to many turbulent flows in photonic quantum fluids, hydrodynamics and Bose-Einstein condensates.

References

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Citations

Jun 1, 2017·Nature Communications·Iván R Roa GonzálezRaman Kashyap
Jul 16, 2019·Optics Letters·Domenico BongiovanniRoberto Morandotti
Aug 27, 2016·Physical Review Letters·Benjamin WetzelRoberto Morandotti
Feb 26, 2016·Optics Letters·Theodoros P Horikis, Dimitrios J Frantzeskakis
Jan 1, 2021·Optics Express·Domenico BongiovanniZhigang Chen
Jan 8, 2021·Physical Review Letters·Giulia MarcucciZhigang Chen
Jul 17, 2021·Physical Review Letters·Josselin GarnierAntonio Picozzi

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