论文标题

通过自旋轨耦合镊子握住和转移物质波孤子对重力

Holding and transferring matter-wave solitons against gravity by spin-orbit-coupling tweezers

论文作者

Liu, Bin, Zhong, Rongxuan, Chen, Zhaopin, Qin, Xizhou, Zhong, Honghua, Li, Yongyao, Malomed, Boris A.

论文摘要

我们考虑在重力的作用下,在重力的作用下,在两个组分的bose-einstein冷凝物(BEC)中掌握和拖动一维孤子的可能性。考虑到两种类型的孤子,半偶极子和混合模式。我们发现重力的临界值,在这些力量可以由镊子持有或转移到孤子上。临界力对局部相互作用的大小和空间扩展的依赖性以及孤子的范围和速度(在转移方案中)的依赖性通过数值方法进行了系统地研究,并在唯一的准托盘近似值的帮助下进行了分析。特别是一个值得注意的发现是,临界重力随着传递速度的增加而增加(即移动孤子比静态的孤子更强大)。通过考虑突然将重力应用于失重环境中创建的孤子的应用,也可以解决非机构制度。在这种情况下,只要重力力不超过动力学临界值,孤子顿族具有阻尼的穿梭运动,该临界值不超过其静态对应物。结果可能有助于根据超电原子设计重量表。

We consider possibilities to grasp and drag one-dimensional solitons in two-component Bose- Einstein condensates (BECs), under the action of gravity, by tweezers induced by spatially confined spin-orbit (SO) coupling applied to the BEC, with the help of focused laser illumination. Solitons of two types are considered, semi-dipoles and mixed modes. We find critical values of the gravity force, up to which the solitons may be held or transferred by the tweezers. The dependence of the critical force on the magnitude and spatial extension of the localized SO interaction, as well as on the solitons norm and speed (in the transfer regime), are systematically studied by means of numerical methods, and analytically with the help of a quasi-particle approximation for the soliton. In particular, a noteworthy finding is that the critical gravity force increases with the increase of the transfer speed (i.e., moving solitons are more robust than quiescent ones). Nonstationary regimes are addressed too, by considering abrupt application of gravity to solitons created in the weightless setting. In that case, solitons feature damped shuttle motion, provided that the gravity force does not exceed a dynamical critical value, which is smaller than its static counterpart. The results may help to design gravimeters based on ultracold atoms.

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