论文标题
Bose-Einstein冷凝物中杂质的量子动力学
Quantum dynamics of impurities in a Bose-Einstein condensate
论文作者
论文摘要
我们研究了被困的准二维Bose-Einstein冷凝物（BEC）中两种杂质的量子动力学。我们探讨了杂质-BEC和杂质 - 障碍相互作用强度对Bose-Einstein冷凝物内部杂质动力学的影响。通过研究杂质和BEC的自动相关函数，我们分析和量化了BEC内部杂质的捕获。我们发现，对于耦合强度的较小值，BEC开始在陷阱内振荡。对于轻度耦合强度，在BEC内部进行了几次振荡后，捕获了有吸引力和令人反感的杂质。在强大的相互作用强度状态下，杂质的直接运动被抑制很快。我们的结论表明，淬灭动态可以是研究杂质相互作用或杂质 - 障碍相互作用的工具。我们的分析表明，声子，冲击波，孤子火车和自捕获的产生很大程度上取决于杂质-BEC耦合系数。
We study the quantum dynamics of the two impurities in a trapped quasi-one-dimensional Bose-Einstein condensate (BEC). We explore the effect of impurity-BEC and impurity-impurity interaction strengths on the dynamics of impurities inside the Bose-Einstein condensate. By studying the auto-correlation function of impurities and the BEC, we analyze and quantify the trapping of impurities inside the BEC. We find out that for the small value of inter-species coupling strength the BEC starts to oscillate inside the trap. For mild coupling strengths, attractive and repulsive impurities are captured after a few cycles of oscillation inside the BEC. In the strong interaction strength regime, the to-and-fro motion of impurities is suppressed quite fast. Our conclusion indicates that quench dynamics can be a tool for studying impurity BEC interactions or impurity-impurity interactions. Our analysis shows that the generation of phonon, shock waves, soliton trains, and self-trapping is strongly dependent on the impurity-BEC coupling coefficient.
