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Scientists observe ‘quasiparticles’ in classical methods

Quasiparticles — long-lived particle-like excitations — are a cornerstone of quantum physics, with well-known examples reminiscent of Cooper pairs in superconductivity and, lately, Dirac quasiparticles in graphene. Now, researchers have found quasiparticles in a classical system at room temperature: a two-dimensional crystal of particles pushed by viscous stream in a microfluidic channel. Coupled by hydrodynamic forces, the particles kind steady pairs — a primary instance of classical quasiparticles, revealing deep hyperlinks between quantum and classical dissipative methods.