Quantum gases with tunable interactions in optical lattices and photoassociation of molecules in optical lattices

光学晶格中具有可调相互作用的量子气体和光学晶格中分子的光缔合

• 批准号: 5407488
• 负责人: Professor Dr. Immanuel Bloch
• 金额: --
• 依托单位: Lehrstuhl für Experimentalphysik - Quantenoptik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5407488?language=en
• 关键词: Quantum; gases; tunable; interactions; optical

We are planning to pursue two main experimental research goals within the second funding period of this "Schwerpunktprogramm". Building on our highly successful work on Bose-Einstein condensates in optical lattices, we will focus our work on the creation of a 85Rb condensate in an optical lattice potential. In 85Rb a broad Feshbach resonance would allow us to tune the scattering length of the atoms over a wide range and thereby have complete control over the interaction parameters between the atoms. We therefore would not only be able to tune the tunnel coupling between different lattice sites through the optical lattice potential depth, but also control the interaction parameter and thereby gain complete control over all parameters in the fundamental underlying Bose-Hubbard Hamiltonian. A controllable onsite interaction parameter would be very useful in order to study the Mott insulator phase transition by simply changing the interactions between the atoms and would also allow us to resolve many interaction related effects spectroscopically by having a higher and then more easily resolvable energy scale given by U. A second focus of our work will be directed towards the creation of ultracold molecules in optical lattices via coherent two-photon photoassociation processes. By filling lattice sites from a Mott insulator with two atoms one could induce a highly effective bound-bound photoassociation process to vibrational states in the triplet or singlet molecular ground state potential.

我们计划在“Schwerpunktprogramm”的第二个资助期内实现两个主要实验研究目标。基于我们在光学晶格中玻色-爱因斯坦凝聚态方面取得的巨大成功，我们将把工作重点放在在光学晶格势中创建 85Rb 凝聚态。在 85Rb 中，广泛的费什巴赫共振使我们能够在很宽的范围内调整原子的散射长度，从而完全控制原子之间的相互作用参数。因此，我们不仅能够通过光学晶格势深度来调整不同晶格位置之间的隧道耦合，而且还能够控制相互作用参数，从而完全控制基本玻色-哈伯德哈密顿量中的所有参数。可控的现场相互作用参数对于通过简单地改变原子之间的相互作用来研究莫特绝缘体相变非常有用，并且还允许我们通过U给出的更高且更容易解析的能量尺度来从光谱上解决许多与相互作用相关的效应。我们工作的第二个重点将是通过相干双光子光缔合过程在光学晶格中创建超冷分子。通过用两个原子填充莫特绝缘体的晶格位点，可以诱导一种高效的束缚光缔合过程，形成三重态或单重态分子基态势的振动态。