存在旋转弱连接时环形几何中少数玻色子的超流性分数
Superfluidity fraction of few bosons in an annular geometry in the presence of a rotating weak link
摘要：
本文报道了一种超平均场方法，计算了在势垒诱导的旋转弱连接存在下，被限制在环形几何中的几个玻色子系统的质量流和超流率。我们应用多组态Hartree方法计算玻色子的基态，并显示了在很宽的相互作用强度和势垒高度范围内的平均超流性分数，突出了密度关联函数的行为。超流性分数的减少，由于势垒高度的增加而被发现，而冷凝分数完全取决于相互作用强度，这两种现象的独立性。
英文摘要：
We report a beyond mean-field calculation of mass current and superfluidity fraction for a system of few bosons confined in a ring geometry in the presence of a rotating weak link induced by a potential barrier. We apply the Multiconfiguration Hartree Method for bosons to compute the ground state of the system and show the average superfluidity fraction for a wide range of interaction strength and barrier height, highlighting the behavior of density correlation functions. The decrease of superfluidity fraction due to the increase of barrier height is found whereas the condensation fraction depends exclusively on the interaction strength, showing the independence of both phenomena.
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