论文标题
离散的时间晶体由拓扑边缘元素制成
Discrete time crystal made of topological edge magnons
论文作者
论文摘要
我们报告了在外部驾驶场的存在下，在π-莓相保护的边缘状态下，在π-莓相保护的边缘状态下出现了时间结晶行为。由于外场而引起的镁扩增会自发打破离散的时间传递对称性，从而导致离散的时间晶体，其周期是所施加的EM场的两倍。我们讨论了时间晶体边缘状态的性质和对称性保护及其稳定性，以抵抗实际量子磁体中预期的各种扰动。我们提出了一个实验签名，以明确检测时间晶体行为，并确定两个最近发现的准2D磁铁作为潜在宿主。我们提出了在拓扑边缘状态下时间晶体的首先实现，可以将其推广并推断到其他表现出参数泵送和拓扑边缘状态的Bosonic准准颗粒系统。
We report the emergence of time-crystalline behavior in the π-Berry phase protected edge states of a Heisenberg ferromagnet in the presence of an external driving field. The magnon amplification due to the external field spontaneously breaks the discrete time-translational symmetry, resulting in a discrete time crystal with a period that is twice that of the applied EM field. We discuss the nature and symmetry protection of the time crystalline edge states and their stability against various perturbations that are expected in real quantum magnets. We propose an experimental signature to unambiguously detect the time crystalline behavior and identify two recently discovered quasi-2D magnets as potential hosts. We present a first-of-its-kind realization of time crystals at topological edge states, which can be generalized and extrapolated to other bosonic quasi-particle systems that exhibit parametric pumping and topological edge states.
