PT-symmetric two-level systems have two topological phases, and switching between them in time makes wave intensity peak at the switch.
Zak ,\ title title Berry’s phase for energy bands in solids ,\ @noop journal journal Physical review letters \ volume 62 ,\ pages 2747 ( year 1989 ) NoStop
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Topological Localisation in Time from PT Symmetry
PT-symmetric two-level systems have two topological phases, and switching between them in time makes wave intensity peak at the switch.