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Nature Physics 4, 673 (1 September 2008) | doi:10.1038/nphys1064

Polariton condensates: A feature rather than a bug

David Snoke

When an ensemble of bosons is cooled to low-enough temperatures, a substantial fraction of the particles spontaneously enter a single quantum state. This phenomenon is known as Bose–Einstein condensation (BEC), and the most famous experiments are those involving atomic gases.