Title: Floquet time crystal (Dr. Long Zhang)
Abstract: In this journal club presentation, I will introduce the notion of "Floquet time crystals", i.e., periodically driven systems that spontaneously break the discrete time translation symmetry, which was theoretically introduced in Ref.  and experimentally realized in Refs. [2, 3] (published with a perspective by C. Nayak, Ref ).
 D. V. Else, B. Bauer, and C. Nayak, Phys. Rev. Lett. 117, 90402 (2016).
 J. Zhang, P. W. Hess, A. Kyprianidis, P. Becker, A. Lee, J. Smith, G. Pagano, I.-D. Potirniche, A. C. Potter, A. Vishwanath, N. Y. Yao, and C. Monroe, Nature 543, 217 (2017).
 S. Choi, J. Choi, R. Landig, G. Kucsko, H. Zhou, J. Isoya, F. Jelezko, S. Onoda, H. Sumiya, V. Khemani, C. von Keyserlingk, N. Y. Yao, E. Demler, and M. D. Lukin, Nature 543, 221 (2017).
 C. Nayak, Nature 543, 185 (2017).