Interacting Two-Element Bose-Fermi Superfluid

相互作用的二元玻色-费米超流体

• 批准号: 1806212
• 负责人: Subhadeep Gupta
• 金额: $ 27万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1806212&HistoricalAwards=false
• 关键词: Interacting; Two; Element; Bose; Fermi

This award will support a project to study properties of superfluid matter, matter that flows without friction. The experiments will be performed on atomic gases cooled to very low temperatures in the laboratory, at which point they can become superfluids. Studies of interactions between such atomic gases will be carried out under controlled application of electromagnetic fields. These studies will provide information regarding the behavior of interacting superfluids and can shed light on aspects of superfluidity that are not yet well understood. The students working on this project will gain experience in experimental methods involving atoms, lasers, and electronics, and also be involved in data analysis, modeling, and connecting experimental results with theory. This will prepare them to join the work force in academics and in industry as part of the next generation of scientists and engineers.The thermometry of strongly-interacting fermions is an outstanding issue and is limited by the sensitivity of current methods. Extending these limits as well as measurement accuracy will help advance the understanding of complex many-body phenomena. The group will utilize the mass and electronic structure differences between fermionic lithium (Li) and bosonic ytterbium (Yb), and a Bose-impurity thermalization method to extend the current reach of Fermi gas and superfluid thermometry. They will also probe dynamics in a novel Bose-Fermi double superfluid system made of Yb and Li atoms. These experiments will advance knowledge in atomic physics, condensed matter physics and nuclear physics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项将支持一个研究超流体物质性质的项目，超流体物质是指无摩擦流动的物质。这些实验将在实验室中对冷却到极低温度的原子气体进行，在这一点上，它们可以成为超流体。对这种原子气体之间相互作用的研究将在电磁场的受控应用下进行。这些研究将提供关于相互作用的超流体行为的信息，并可以揭示尚未被很好理解的超流性的一些方面。从事这个项目的学生将获得涉及原子、激光和电子学的实验方法的经验，还将参与数据分析、建模以及将实验结果与理论联系起来。这将使他们做好准备，加入学术界和工业界的工作大军，成为下一代科学家和工程师的一部分。强相互作用费米子的温度测量是一个悬而未决的问题，受到当前方法灵敏度的限制。扩展这些极限以及测量精度将有助于推进对复杂多体现象的理解。该小组将利用费米子锂(Li)和玻色子Yb(Yb)之间的质量和电子结构差异，以及玻色-杂质热化方法来扩大费米气体和超流体测温的当前范围。他们还将探测由Yb和Li原子组成的新型玻色-费米双超流体系统的动力学。这些实验将促进原子物理、凝聚态物理和核物理方面的知识。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Two-photon photoassociation spectroscopy of the Σ+2 YbLi molecular ground state

Σ 2 YbLi 分子基态的双光子光缔合光谱

• DOI: 10.1103/physreva.99.063416
• 发表时间: 2019
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Green, Alaina;See Toh, Jun Hui;Roy, Richard;Li, Ming;Kotochigova, Svetlana;Gupta, Subhadeep
• 通讯作者: Gupta, Subhadeep