Bose polaron in spherical trap potentials: Spatial structure and quantum depletion
Bose polaron in spherical trap potentials: Spatial structure and quantum depletion
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DOI：
10.1103/physreva.100.023624
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发表时间：
2019-04
影响因子：
2.9
通讯作者：
J. Takahashi;R. Imai;E. Nakano;K. Iida
中科院分区：
文献类型：
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作者：
J. Takahashi;R. Imai;E. Nakano;K. Iida
我们研究如何存在的局部杂质的玻色-爱因斯坦凝聚体中的被困冷原子相互作用弱，排斥影响的压缩和激发组件在零温度下的配置文件。通过求解Gross-Pitaevskii方程和Bogoliubov-de Gennes方程，我们发现杂质-玻色子接触吸引（排斥）导致两个分量在空间结构上发生变化，从而在杂质周围增强（抑制），而在远离杂质的区域略有下降（增长）。这种行为的量子耗尽的冷凝物可以理解通过分解的杂质引起的变化的轮廓的激发组件相对于径向和方位角量子数。离心势和“孔”激发水平的一个重要作用，从而澄清。
We investigate how the presence of a localized impurity in a Bose-Einstein condensate of trapped cold atoms that interact with each other weakly and repulsively affects the profile of the condensed and excited components at zero temperature. By solving the Gross-Pitaevskii and Bogoliubov-de Gennes equations, we find that an impurity-boson contact attraction (repulsion) causes both components to change in spatial structure in such a way as to be enhanced (suppressed) around the impurity, while slightly declining (growing) in a far region from the impurity. Such behavior of the quantum depletion of the condensate can be understood by decomposing the impurity-induced change in the profile of the excited component with respect to the radial and azimuthal quantum number. A significant role of the centrifugal potential and the "hole" excitation level is thus clarified.