标题： 大质量多涡旋项链和星形晶格中的超电流和隧穿 显示英文标题

标题： Supercurrents and tunneling in massive many-vortex necklaces and star-lattices

摘要： 最近，由于它们与单组分系统相比具有新颖的特性以及奇特的量子效应，冷原子混合物引起了广泛的兴趣。 本文的重点是大量涡旋态及其动力学。 当受限于拓扑非等价的几何结构时，研究了具有相同离散旋转对称性的涡旋构型，并强调了在不同涡旋数量和填充质量下的相对稳定性特性。 数值表明，在玻色-爱因斯坦凝聚物的混合物中，大量涡旋系统可以以无序的方式容纳填充组分的玻色子隧穿，其中隧穿事件涉及两个或多个靠近的涡旋，或者在涡旋以持续的项链或星形晶格形式排列时以几乎周期性的方式进行。 目的是探索涉及高度非线性涡旋动力学与涡旋间原子转移相互作用的各种情况，从而更好地理解旋转系统中约瑟夫森超流的起始条件，或揭示可能对未来应用（例如在原子电子学领域）有重要意义的现象。 显示英文摘要

摘要： Recently, cold atoms mixtures have attracted broad interest due to their novel properties and exotic quantum effects with respect to single-component systems. In this paper the focus is on massive many-vortex states and their dynamics. Vortex configurations characterized by the same discrete rotational symmetry are investigated when confined within topologically nonequivalent geometries, and the relative stability properties at varying number of vortices and infilling mass are highlighted. It is numerically shown how massive many-vortex systems, in a mixture of Bose-Einstein condensates, can host the bosonic tunneling of the infilling component both in a disordered way, with tunneling events involving two or more close vortices, or in an almost-periodic way when the vortices are organized in persisting necklaces or star-lattices. The purpose is to explore a variety of situations involving the interplay between the highly-nonlinear vortex dynamics and the inter-vortex atomic transfer, and so to better understand the conditions for the onset of Josephson supercurrents in rotating systems, or to reveal phenomena that could be of interest for a future application e.g. in the context of atomtronics.