论文标题
双物种玻色 - 因斯坦与具有吸引力的种间相互作用的凝结物
A dual-species Bose-Einstein condensate with attractive interspecies interactions
论文作者
论文摘要
我们报告了$^{41} $ k-$^{87} $ rb双物种bose-inenstein冷凝物具有可调节种间互动的情况，并且我们研究了有吸引力的政权中的混合物，即，对于杂交长度的负值$ a_ {12} $。二进制冷凝物以基态制备，并限制在纯光学陷阱中。我们利用Feshbach共振来调整$ a_ {12} $的值。在用磁场梯度补偿了两个物种之间的重力下垂后，我们将混合物驱动到有吸引力的方向上。我们让系统在自由空间和光学波导中均演化。在这两个几何形状中，对于强烈的有吸引力的相互作用，我们观察到自结界状态的形成，可以识别为量子液滴。我们的发现证明，尽管两个原子成分可能会遇到不同的潜力，但稳健，寿命长的液滴状态仍可以在有吸引力的两种物种混合物中实现。
We report on the production of a $^{41}$K-$^{87}$Rb dual-species Bose-Einstein condensate with tunable interspecies interaction and we study the mixture in the attractive regime, i.e. for negative values of the interspecies scattering length $a_{12}$. The binary condensate is prepared in the ground state and confined in a pure optical trap. We exploit Feshbach resonances for tuning the value of $a_{12}$. After compensating the gravitational sag between the two species with a magnetic field gradient, we drive the mixture into the attractive regime. We let the system to evolve both in free space and in an optical waveguide. In both geometries, for strong attractive interactions, we observe the formation of self-bound states, recognizable as quantum droplets. Our findings prove that robust, long-lived droplet states can be realized in attractive two-species mixtures, despite the two atomic components may experience different potentials.
