Recent work shows that there is a sharp notion of .phase of matter. in
periodically driven many-body localised systems. In this talk I give a
pedagogical review of perhaps the simplest such driven phase of matter, known
as the pi spin-glass/ time crystal. A key feature of this phase is that in the
thermodynamic limit, for fairly generic initial states, generic local
observable show persistent oscillations at late times commensurate with the
driving period.
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