Space-time crystals of trapped ions.

@article{Li2012SpacetimeCO,
  title={Space-time crystals of trapped ions.},
  author={Tongcang Li and Zhe-Xuan Gong and Zhang‐qi Yin and Haitao Quan and Xiaobo Yin and Peng Zhang and Luming Duan and Xiang Zhang},
  journal={Physical review letters},
  year={2012},
  volume={109 16},
  pages={
          163001
        }
}
Spontaneous symmetry breaking can lead to the formation of time crystals, as well as spatial crystals. Here we propose a space-time crystal of trapped ions and a method to realize it experimentally by confining ions in a ring-shaped trapping potential with a static magnetic field. The ions spontaneously form a spatial ring crystal due to Coulomb repulsion. This ion crystal can rotate persistently at the lowest quantum energy state in magnetic fields with fractional fluxes. The persistent… 

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