# Condensed matter physics in time crystals

@article{Guo2020CondensedMP,
title={Condensed matter physics in time crystals},
author={Lingzhen Guo and Pengfei Liang},
journal={New Journal of Physics},
year={2020},
volume={22}
}
• Published 6 May 2020
• Physics
• New Journal of Physics
Time crystals are physical systems whose time translation symmetry is spontaneously broken. Although the spontaneous breaking of continuous time-translation symmetry in static systems is proved impossible for the equilibrium state, the discrete time-translation symmetry in periodically driven (Floquet) systems is allowed to be spontaneously broken, resulting in the so-called Floquet or discrete time crystals. While most works so far searching for time crystals focus on the symmetry breaking…
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