A two-dimensional ultracold gas of fermionic polar LiCs molecules

该项目的目的是产生一种费米LiCs分子的偶极量子气体，以研究长程偶极相互作用影响下的少体和多体效应。LiCs在振转基态的偶极矩为5.5德拜。 如此大的偶极矩非常适合于探索强偶极相互作用的影响，例如在偶极晶体，自旋模型和超固相中发生的。为了研究这些现象，费米子极性分子的气体将被稳定对非弹性碰撞损失的光学限制它在一个2D的几何形状，允许控制的少体化学反应和发展的全面理解的基础少体碰撞过程。超冷分子的产生是基于在6Li和133Cs的双简并混合原子气体中在光偶极阱中产生弱结合的Feshbach分子，随后STIRAP到振转基态。 偶极相互作用将由微波电场控制。 在这项研究计划的过程中，我们将开发通过极性分子的蒸发冷却来增加相空间密度的策略。极性分子的稳定气体和强偶极相互作用能的组合使得在平衡和非平衡条件下探索偶极量子气体成为可能。

The aim of this project is to produce a dipolar quantum gas of fermionic LiCs molecules to study few- and many-body effects under the influence of long-range dipolar interaction. LiCs features a dipole moment of 5.5 Debye in the rovibrational ground state. Such a large dipole moment is ideally suited to explore the effects of strong dipolar interactions, as occurring for example in dipolar crystals, spin models, and super solid phases. In order to investigate these phenomena, the gas of fermionic polar molecules will be stabilized against inelastic collisional loss by optically confining it in a 2D geometry allowing for the control over the few-body chemical reactions and for the development of a comprehensive understanding of the underlying few-body collisional processes. The creation of the ultracold molecules is based on the production of weakly bound Feshbach molecules in a double-degenerate mixed atomic gas of 6Li and 133Cs in an optical dipole trap and subsequent STIRAP to the rovibrational ground state. The dipolar interaction will be controlled by microwave electric fields. In the course of this research program we will develop strategies for an increase of the phase space density by evaporative cooling of polar molecules. The combination of a stabilized gas of polar molecules and strong dipolar interaction energy makes it possible to explore the dipolar quantum gas under equilibrium and out-of-equilibrium conditions.