Floquet strong Hilbert space fragmentation stabilizes discrete time crystals in a disorder-free kicked XXZ spin chain, with lifetime independent of frequency and exponential in system size.
Simultaneously, the spin-flip operationU 1 =Xalso preserves the domain wall count [U1, Pdw] = 0
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Discrete time crystals enabled by Floquet strong Hilbert space fragmentation
Floquet strong Hilbert space fragmentation stabilizes discrete time crystals in a disorder-free kicked XXZ spin chain, with lifetime independent of frequency and exponential in system size.