What is a Time Crystal? Is disorder a necessary ingredient to stabilize this new phase of matter that features a robust sub-harmonic time response? In this paper we investigate what are the conditions to observe a prethermal time crystal and its dependence on the frequency drive and the initial state.

• Observation of a Prethermal Time Crystal:
  A. Kyprianidis, F. Machado, W. Morong, P. Becker, K. S. Collins, D. V. Else, L. Feng, P. W. Hess, C. Nayak, G. Pagano, N. Y. Yao, C. Monroe, Science, 372, 1192 (2021).
• Rice News Press Release