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Glidden, Jake A. P.; Eigen, Christoph; Dogra, Lena H.; Hilker, Timon A.; Smith, Robert P.; Hadzibabic, Zoran
Nature physics, 04/2021, Volume: 17, Issue: 4Journal Article
Understanding and classifying non-equilibrium many-body phenomena, analogously to the classification of equilibrium states of matter into universality classes1,2, is an outstanding problem in physics. From stellar matter to financial markets, any many-body system can be out of equilibrium in a myriad of ways, and many are difficult to experiment on. It is therefore a major goal to establish universal principles that apply to different phenomena and physical systems. For equilibrium states, the universality seen in the self-similar spatial scaling of systems close to phase transitions lies at the heart of their classification. Recent theoretical work3–14 and experimental evidence15,16 suggest that isolated many-body systems far from equilibrium generically exhibit dynamic (spatiotemporal) self-similar scaling, akin to turbulent cascades17 and the Family–Vicsek scaling in classical surface growth18,19. Here we observe bidirectional dynamic scaling in an isolated quench-cooled atomic Bose gas; as the gas thermalizes and undergoes Bose–Einstein condensation, it shows self-similar net flows of particles towards the infrared (smaller momenta) and energy towards the ultraviolet (smaller length scales). For both infrared and ultraviolet dynamics we find that the scaling exponents are independent of the strength of the interparticle interactions that drive the thermalization.Momentum-space transport behaviour studied in a quench-cooled isolated atomic Bose gas shows a self-similar scaling character, implying the existence of a far-from-equilibrium universality class.
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