Nature Physics, Published online: 26 May 2025; doi:10.1038/s41567-025-02913-w
Symmetry breaking is routinely observed in isolated systems, where perturbations propagate through the system. For out-of-equilibrium systems, however, perturbations are predicted to diffuse; and this key signature of spontaneous symmetry breaking has now been observed in a polariton quantum fluid.
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- Perturbations in out-of-equilibrium quantum fluids diffuse rather than propagate
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