So is the idea of a "time crystal is supposed to have periodic structure at the lowest energy state" out of the window?
If an external periodic pulse is required to drive the crystal to change its structure periodically, the time aspect is coming from the external pulse. The crystal itself doesn't have an intrinsic structural periodicity. The periodicity comes from the external pulsing. Is it still qualified to be called a "time crystal"?
The 2X slower reversing rate does show it has a time magnifying aspect, which can be huge.
If an external periodic pulse is required to drive the crystal to change its structure periodically, the time aspect is coming from the external pulse. The crystal itself doesn't have an intrinsic structural periodicity. The periodicity comes from the external pulsing. Is it still qualified to be called a "time crystal"?
The 2X slower reversing rate does show it has a time magnifying aspect, which can be huge.