U.S.-France Cooperative Research: Nuclear Magnetic Properties of Superfluid 3He in Bulk and Confined Geometries

美法合作研究：超流体3He在整体和受限几何结构中的核磁特性

• 批准号: 0128811
• 负责人: David Lee
• 金额: $ 1.98万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-02-01 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0128811&HistoricalAwards=false
• 关键词: U.S.; France; Cooperative; Research; Nuclear

0128811LeeThis three-year award for U.S.-France collaboration in condensed matter physics involves research groups at Cornell University and the Center for Low Temperature Physics Research in Grenoble, France. David M. Lee, Jeevak M. Parpia and John Reppy lead the US effort; Yuriy Bunkov and Henri Godrin lead the French group. The focus of the research is superfluid 3He (helium) - a unique coherent quantum system whose order parameter shows the complex breaking of gauge and rotation symmetries. The main areas to be studied are the relaxation domains in bulk superfluid 3HeB and the nature of the superfluidity of liquid 3He in aerogel. The project involves nuclear magnetic resonance (NMR) studies of 3He at high magnetic fields and at ultra low temperatures. The Cornell group's experiments include exploration of magnetic field dependence of the temperature of catastrophic relation and sound propagation and heat transport in aerogel as a function of magnetic field. This is complemented by French NMR studies of superfluid 3He in aerogel at the limit of ultra low temperatures and theoretical investigations and numerical simulations of catastrophic relaxation. This award represents the US side of joint proposals to the NSF and the French National Center for Scientific Research (CNRS). NSF will cover travel funds and living expenses of the US investigators and postdoctoral researchers. The CNRS will support visits to US of the French participants. The collaboration will advance understanding of 3He systems and applications in cosmology and high-energy physics.

0128811 LeeThis三年奖为美国-法国在凝聚态物理方面的合作涉及康奈尔大学和法国格勒诺布尔低温物理研究中心的研究小组。 大卫M.作者：Lee Parpia和John Reppy领导了美国的努力; Yuriy Bunkov和Henri Godrin领导了法国的小组。 研究的重点是超流3 He（氦）-一种独特的相干量子系统，其序参数显示了规范和旋转对称性的复杂破缺。 主要的研究领域是体相超流3 HeB的弛豫畴和气凝胶中液态3 He的超流性。 该项目涉及在高磁场和超低温下对3 He进行核磁共振（NMR）研究。 康奈尔小组的实验包括探索磁场对温度的依赖性，突变关系以及气凝胶中的声传播和热传输作为磁场的函数。 这是补充法国核磁共振研究超流3 He气凝胶在超低温的极限和理论研究和数值模拟的灾难性松弛。该奖项代表了美国方面向NSF和法国国家科学研究中心（CNRS）提出的联合建议。 NSF将承担美国研究人员和博士后研究人员的差旅费和生活费。 国家科学研究中心将支持法国参与者访问美国。该合作将促进对3 He系统的理解以及在宇宙学和高能物理学中的应用。