论文标题
用超低原子创建大时间晶体
Creating big time crystals with ultracold atoms
论文作者
论文摘要
我们研究了可以为玻色网凝结物（BEC）在振荡镜上共鸣的离散时间晶体S的大小（响应周期与驾驶期的比率）。我们发现，可以创建时间晶体，尺寸在范围内s = 20-100，并且如此大的时间晶体比倍加倍（s = 2）时间晶体更容易实现实验，因为它们需要较大的跌落高度或镜子上较小数量的弹跳。我们还研究了对弹跳BEC具有逼真的软高斯电势镜的影响，例如由排斥的光片生成的镜子，这比硬壁势镜更容易实现实验。最后，我们讨论了基于弹跳BEC创建时间晶体的原子系统的选择，并提出了实现大时间晶体的实验协议。如此大的时间晶体提供了一个灵活的平台，用于研究时域中广泛的非平凡凝结物质现象。
We investigate the size of discrete time crystals s (ratio of response period to driving period) that can be created for a Bose-Einstein condensate (BEC) bouncing resonantly on an oscillating mirror. We find that time crystals can be created with sizes in the range s = 20 - 100 and that such big time crystals are easier to realize experimentally than a period-doubling (s = 2) time crystal because they require either a larger drop height or a smaller number of bounces on the mirror. We also investigate the effects of having a realistic soft Gaussian potential mirror for the bouncing BEC, such as that produced by a repulsive light-sheet, which is found to make the experiment easier to implement than a hard-wall potential mirror. Finally, we discuss the choice of atomic system for creating time crystals based on a bouncing BEC and present an experimental protocol for realizing big time crystals. Such big time crystals provide a flexible platform for investigating a broad range of non-trivial condensed matter phenomena in the time domain.
