论文标题
原子玻色网将其凝结至分子玻璃凝结物过渡
Atomic Bose-Einstein condensate to molecular Bose-Einstein condensate transition
论文作者
论文摘要
分子量子气的制备有望进行新的应用，包括对化学反应，精确测量，量子模拟和量子信息处理的量子控制。然而，较冷和更密集的分子样品的实验制备经常受到加热和耗尽种群的快速无弹性碰撞的阻碍。在这里，我们通过在原子冷凝物中诱导配对相互作用来形成旋转$ g- $波分子的二维玻色凝结物（BEC）。分子的陷阱几何形状和低温有助于减少非弹性损失，以确保热平衡。我们确定分子散射长度为$+220（30）$ 〜BOHR，并研究了强耦合方案中的不合格动力学。我们的工作证实了原子和分子冷凝物之间的长期过渡，即Fermi气体中BEC-BCS（Bardeen-Cooper-Schieffer Superfluid）的Bosonic类似物。
Preparation of molecular quantum gas promises novel applications including quantum control of chemical reactions, precision measurements, quantum simulation and quantum information processing. Experimental preparation of colder and denser molecular samples, however, is frequently hindered by fast inelastic collisions that heat and deplete the population. Here we report the formation of two-dimensional Bose-Einstein condensates (BECs) of spinning $g-$wave molecules by inducing pairing interactions in an atomic condensate. The trap geometry and the low temperature of the molecules help reducing inelastic loss to ensure thermal equilibrium. We determine the molecular scattering length to be $+220(30)$~Bohr and investigate the unpairing dynamics in the strong coupling regime. Our work confirms the long-sought transition between atomic and molecular condensates, the bosonic analog of the BEC-BCS (Bardeen-Cooper-Schieffer superfluid) crossover in a Fermi gas.
