A flat-band drive that freezes spin dynamics for half each period, followed by a global spin flip, is claimed to produce period-doubling time-crystal order in clean spin chains—but the stated parameters yield only a π/2 pulse.
Choudhury, Atoms9, 10.3390/atoms9020025 (2021)
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Discrete time crystal order in spin chains enabled by Floquet flat bands
A flat-band drive that freezes spin dynamics for half each period, followed by a global spin flip, is claimed to produce period-doubling time-crystal order in clean spin chains—but the stated parameters yield only a π/2 pulse.