RUI: Many-Body Effects in a Frozen Rydberg Gas

RUI：冷冻里德堡气体中的多体效应

• 批准号: 0140430
• 负责人: Duncan Tate
• 金额: $ 20.03万
• 依托单位: Colby College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0140430&HistoricalAwards=false
• 关键词: RUI; Many; Body; Effects; Frozen

This RUI award provides support for a research program on collisions of cold, dense samples of Rydberg atoms. The Rydberg atoms in this environment are strongly coupled by the dipole interaction. Two novel features define this environment. First, the atoms move a distance that is significantly less than their mean separation during the time the collision lasts. Second, the mean atomic separation is less than the impact parameter, indicating that many-body effects are important. The interactions of a dense sample of cold Rydberg atoms are therefore less like those in a "normal" gas, and more like those characteristic of a diffuse liquid or disordered solid. The term "frozen gas" has been used to describe this environment. Two major areas of research will be pursued: 1) Exciton processes in a frozen gas, in which various predictions of an exciton diffusion model for migration of population away from close atoms will be investigated and 2) Preliminary investigations of multiphoton radiatively assisted collisions in the many-body regime. By virtue of being at an undergraduate institution with a significant number of physics majors, this research program offers educational preparation for students wishing to continue on to graduate school or enter the advanced high-tech workforce.

该 RUI 奖项为冷、致密里德伯原子样本碰撞的研究项目提供支持。这种环境中的里德伯原子通过偶极相互作用强烈耦合。这个环境有两个新颖的特征。首先，原子移动的距离明显小于碰撞持续期间它们的平均间距。其次，平均原子间距小于碰撞参数，表明多体效应很重要。因此，冷里德伯原子致密样品的相互作用不太像“正常”气体中的相互作用，而更像是扩散液体或无序固体的相互作用。 “冷冻气体”一词已被用来描述这种环境。 将进行两个主要研究领域：1）冷冻气体中的激子过程，其中将研究对远离邻近原子的粒子群迁移的激子扩散模型的各种预测；2）对多体体系中多光子辐射辅助碰撞的初步研究。 由于位于拥有大量物理专业的本科院校，该研究项目为希望继续读研究生或进入先进高科技劳动力市场的学生提供教育准备。