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Possible space-time crystal which may be realized in a system of ultracold ions, confined on a ring in a weak magnetic field (red arrows). Selected for a Viewpoint in Physics. [Tongcang Li, Zhe-Xuan Gong, Zhang-Qi Yin, H. T. Quan, Xiaobo Yin, Peng Zhang, L.-M. Duan, and Xiang Zhang, Phys. Rev. Lett. 109, 163001 (2012)] |
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