论文标题
相互作用的玻色子混合物的偶极动力学
Dipole dynamics of an interacting bosonic mixture
论文作者
论文摘要
我们揭示了具有可调偶联物质相互作用的两种物种的玻色网凝结物的偶联偶极动力学。我们在光学陷阱中产生$^{41} $ k-$^{87} $ rb的退化混合物，我们研究了线性响应方案中两个原子种的偶极振荡。将种间相互作用从弱吸引力的一侧变化时，我们测量了两个偶极子本征的频率和组成。对于足够的强烈相互作用，即使是平均场倒塌之外，我们发现低能量本质模式的频率仅取决于裸露的陷阱频率和物种种群不平衡。实验结果通过基于两个耦合的pitaevskii方程的数值模拟很好地再现。我们的发现提供了不对称骨气混合物中偶极激发的详细图片。
We unravel the coupled dipole dynamics of a two-species Bose-Einstein condensate with tunable interspecies interaction. We produce a degenerate mixture of $^{41}$K-$^{87}$Rb in an optical trap and we study the dipole oscillations of both atomic species in the linear response regime. Varying the interspecies interaction from the weakly to the strongly attractive side, we measure the frequencies and the composition of the two dipole eigenmodes. For enough strong interactions, even beyond the mean-field collapse, we find that the frequency of the low-energy eigenmode is determined only by the bare trap frequencies and the species population imbalance. The experimental results are well reproduced by numerical simulations based on two coupled Gross-Pitaevskii equations. Our findings provide a detailed picture of the dipole excitations in asymmetric bosonic mixtures.
