权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Many-body physics of ultracold gas mixtures with large mass difference

大质量差超冷气体混合物的多体物理

基本信息

批准号：
77104169
负责人：
Professor Dr. Claus Zimmermann
金额：
--
依托单位：
Physikalisches Institut
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/77104169?language=en
关键词：
Many body physics ultracold gas

项目摘要

This project is based on interspecies Feshbach resonances in mixtures of lithium and rubidium atoms which have recently been discovered in our group. With these resonances it will be possible to create strongly correlated many body quantum systems of bosonic and fermionic atoms with large mass ratio. The large mass difference of the constituents (fermionic 6Li, bosonic 7Li, and bosonic 87Rb) is the unique feature of our experiment. It will allow us to realize scenarios in which fermionic lithium generates a Born-Oppenheimer type interaction potential between bosonic rubidium atoms. A prominent signature of such an interaction is the existence of heteronuclear Efimov states, which has been predicted recently. These bound states result from attractive forces between two heavy (rubidium) atoms via an exchange of one light (lithium) atom. Similar to its recently observed homonuclear counterpart, the energy spectrum of such a novel heteronuclear three-body quantum compound is also expected to obey universal scaling laws. Their experimental verification is strongly facilitated in mixtures with large mass ratios as given in our experiment. A second consequence of lithium-induced Born-Oppenheimer forces between rubidium atoms is the formation of “gaseous solids”, i.e. crystalline structures in a dilute gas reminiscent of metallic binding in a solid. They are expected to emerge from mixtures prestructured in a 3D optical lattice. Within this project we also plan to address further topics of fundamental many-body physics such as heteronuclear Tonks gases and Luttinger liquids with 6Li-87Rb fermion-boson and 7Li-87Rb boson-boson mixtures. With our improved apparatus these systems should be well accessible.Our project aims at stringent tests of fundamental models in many-body physics. In general, the experimental realization of such models currently pursued in many groups around the world may turn out as the most important long term result of ultracold atomic physics. Our particular atomic mixture readdresses fundamental questions in condensed matter and solid state physics from the angle of large mass differences and may thus significantly contribute to their solution.

这个项目是基于我们小组最近发现的锂和Rb原子混合物中的物种间Feshbach共振。有了这些共振，就有可能创建具有大质量比的玻色子和费米子原子的强关联多体量子系统。组分(费米子6Li、玻色子7Li和玻色子87Rb)的大质量差是我们实验的独特之处。它将使我们能够实现费米子锂在玻色态Rb原子之间产生Born-Oppenheimer类型相互作用势的场景。这种相互作用的一个显著特征是存在异核Efimov态，这是最近预测的。这些束缚态是由两个重原子之间的引力通过一个轻原子(锂原子)的交换而产生的。与最近观察到的同核化合物类似，这种新型的异核三体量子化合物的能谱也有望遵守普遍的标度定律。它们的实验验证在我们的实验中给出的大质量比混合物中得到了极大的便利。锂诱导的原子之间的Born-Oppenheimer力的第二个后果是形成“气体固体”，即稀薄气体中的晶体结构，使人想起固体中的金属结合。它们有望从预先构建在3D光学晶格中的混合物中出现。在这个项目中，我们还计划解决更多的基本多体物理主题，如异核Tonks气体和带有6Li-87Rb费米子-玻色子和7Li-87Rb玻色子-玻色子混合物的Luttinger液体。有了我们改进的仪器，这些系统应该可以很好地使用。我们的项目旨在对多体物理中的基本模型进行严格的测试。总体而言，目前世界上许多小组正在追求的这类模型的实验实现，可能会成为超冷原子物理学最重要的长期结果。我们独特的原子混合物从大质量差的角度重新研究了凝聚态和固态物理中的基本问题，因此可能对它们的解决做出重大贡献。