Period-doubled, prethermal time-crystalline signatures can appear in the autocorrelation of staggered magnetization for an unpolarized ground state, even though the magnetization expectation value is zero.
Bruno, Impossibility of spontaneously rotating time crystals: a no-go theorem, Physical review letters111, 070402 (2013)
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Unpolarized prethermal discrete time crystal
Period-doubled, prethermal time-crystalline signatures can appear in the autocorrelation of staggered magnetization for an unpolarized ground state, even though the magnetization expectation value is zero.