Resonance phenomena in ultracold dipole-dipole scattering

Evidence of quadrupole-quadrupole interactions in ultracold gases

Van der Waals interactions are interactions between dipoles. Similarly, quadrupole-quadrupole interactions are interactions between quadrupoles. In this article, we focus on the interactions between two dipoles or two quadrupoles. Classically, we treat one Rydberg atom as a dipole; an outer excited electron and an ion core are the two poles of a dipole. Quantum mechanically, we consider Rydberg transition dipoles. Therefore, dipole-dipole interactions are the interactions between two Rydberg atoms. Rydberg atoms have quadrupole components; consequently, the interactions between two Rydberg ato…

Universal resonant ultracold molecular scattering

The elastic scattering amplitudes of indistinguishable, bosonic, strongly-polar molecules possess universal properties at the coldest temperatures due to wave propagation in the long-range dipole-dipole field. Universal scattering cross sections and anisotropic threshold angular distributions, independent of molecular species, result from careful tuning of the dipole moment with an applied electric field. Three distinct families of threshold resonances also occur for specific field strengths, and can be both qualitatively and quantitatively predicted using elementary adiabatic and semi-classic…

超冷分子气体中偶极相互作用的极端损失抑制与宽可调性

Extreme Loss Suppression and Wide Tunability of Dipolar Interactions in an Ultracold Molecular Gas

本研究利用双微波修饰实现超冷基态分子气体两体与三体损失的极端抑制，并在宽范围内连续调节偶极长度，为强偶极量子液体研究奠定基础。

超冷偶极分子自束缚液滴的观测

Observation of Self-Bound Droplets of Ultracold Dipolar Molecules

该研究利用微波缀饰调控钠-铯分子BEC的偶极相互作用，在平衡与非平衡条件下观测到高密度自束缚液滴及1D到2D阵列转变。