论文标题
在雷德伯格（Rydberg）穿着的玻色网凝结物中的maxon和roton模式的动态激发
Dynamical excitation of maxon and roton modes in a Rydberg-Dressed Bose-Einstein Condensate
论文作者
论文摘要
我们研究了具有软核形状的长距离相互作用的超速原子气体的三维玻色子冷凝物的动力学，这是由激光敷料将原子敷料诱导的，将原子敷料到一个高度激发的rydberg状态。对于均匀的冷凝物，远程相互作用会大大改变激发的分散关系，从而支持Roton和Maxon模式。 Rotons通常是导致超olid的原因，而在具有偶极相互作用的BEC中，Maxons通常是动态不稳定的。我们表明，相反，Rydberg穿着的冷凝水中的Maxon模式在动态上是稳定的。我们发现，Maxon模式可以通过相互作用的淬火激发，即即时打开软核相互作用。 Maxon模式的出现伴随着量子耗竭的高频处的振荡，而Rotons则导致振荡速度较慢。 Roton和Maxon模式的动态稳定激发导致量子耗尽的持续振荡。通过一种自洽的Bogoliubov方法，我们确定了Maxon模式对软核相互作用的依赖性。我们的研究表明，Maxon和Roton模式可以通过淬灭Rydberg穿着的远程相互作用来动态和同时激发。这与当前在创建和探测用超低原子气体的物质状态的研究有关。
We investigate the dynamics of a three-dimensional Bose-Einstein condensate of ultracold atomic gases with a soft-core shape long-range interaction, which is induced by laser dressing the atoms to a highly excited Rydberg state. For a homogeneous condensate, the long-range interaction drastically alters the dispersion relation of the excitation, supporting both roton and maxon modes. Rotons are typically responsible for the creation of supersolids, while maxons are normally dynamically unstable in BECs with dipolar interactions. We show that maxon modes in the Rydberg-dressed condensate, on the contrary, are dynamically stable. We find that the maxon modes can be excited through an interaction quench, i.e. turning on the soft-core interaction instantaneously. The emergence of the maxon modes is accompanied by oscillations at high frequencies in the quantum depletion, while rotons lead to much slower oscillations. The dynamically stable excitation of the roton and maxon modes leads to persistent oscillations in the quantum depletion. Through a self-consistent Bogoliubov approach, we identify the dependence of the maxon mode on the soft-core interaction. Our study shows that maxon and roton modes can be excited dynamically and simultaneously by quenching Rydberg-dressed long-range interactions. This is relevant to current studies in creating and probing exotic states of matter with ultracold atomic gases.
