论文标题
极性分子的现场连接共振
Field-linked resonances of polar molecules
论文作者
论文摘要
散射共振是控制超低原子和分子相互作用的重要工具。但是，由于在大多数超低极性分子中，由于两个分子在近距离接近近距离接近时发生的快速损失，因此在大多数超低极性分子中都不存在常规的Feshbach散射共振。在这里，我们演示了一种新型的散射共振，对于广泛的极性分子而言，这是通用的。所谓的场连接共振发生在微分子稳定的宏观四聚体状态而在分子间电位中稳定的分子的散射。我们确定了超低地面钠钠分子之间的两个共振，并使用微波频率和极化将非弹性碰撞速率调节三个数量级，从单位限制到远低于通用状态。与场连接的共振提供了一个调谐旋钮，可独立控制弹性接触相互作用和偶极 - 偶极相互作用，我们将其视为热率的修改。我们的结果为超速极性分子之间的共振散射提供了一种一般策略，这为实现偶极超氟和分子超酚以及组装超低多原子分子的方式铺平了道路。
Scattering resonances are an essential tool for controlling interactions of ultracold atoms and molecules. However, conventional Feshbach scattering resonances, which have been extensively studied in various platforms, are not expected to exist in most ultracold polar molecules due to the fast loss that occurs when two molecules approach at a close distance. Here, we demonstrate a new type of scattering resonances that is universal for a wide range of polar molecules. The so-called field-linked resonances occur in the scattering of microwave-dressed molecules due to stable macroscopic tetramer states in the intermolecular potential. We identify two resonances between ultracold ground-state sodium-potassium molecules and use the microwave frequencies and polarizations to tune the inelastic collision rate by three orders of magnitude, from the unitary limit to well below the universal regime. The field-linked resonance provides a tuning knob to independently control the elastic contact interaction and the dipole-dipole interaction, which we observe as a modification in the thermalization rate. Our result provides a general strategy for resonant scattering between ultracold polar molecules, which paves the way for realizing dipolar superfluids and molecular supersolids as well as assembling ultracold polyatomic molecules.
