US-France Cooperative Research: Nuclear Spin Dynamics in Solid and Liquid Helium Three

该奖项将支持佛罗里达大学Pradeep Kumar博士和法国奥赛固体体质实验室Maurice Chapellier博士之间的合作研究。研究人员建议研究量子流体或固体中核自旋的动力学。具体而言，研究将集中在以下三个问题上：(1)极化纯稀__________________________液体。研究人员计划研究自旋晶格______弛豫时间T1，并区分体和各种表面机制的作用。他们还将研究粘度和声衰减作为极化的函数。(2)固体/液体界面：主要问题包括__________________________结晶过程的细节，以及磁能在界面上的传递。壁面附近的固体和液体的精确性质对这些问题有关键的影响，也将被研究。(3)低密度固体氦_________________________三：在体和约束几何中，研究人员_____提出了对异常磁化率的精确研究，以测试极化子模型并研究一般由空位引起的弛豫。美国和法国的研究人员在量子流体和固体领域，特别是在液体和固体氦3方面都有丰富的研究经验。本研究的结果将有助于理解量子液体和固体系统的性质，这对凝聚态物理具有重要的基础意义。

This award will support cooperative research between Dr. Pradeep Kumar, University of Florida and Dr. Maurice Chapellier, Laboratoire de Physique des Solides, Orsay, France. The investigators propose to study the dynamics of nuclear spins in a quantum fluid or solid. Specifically, the research will focus on the following three problems: (1) Polarized pure and dilute __________________________ liquid. The investigators plan to study the spin-lattice ______ relaxation time T1 and distinguish between the role of bulk and various surface mechanisms. They will also investigate the viscosity and sound attenuation as a function of the polarization. (2) The solid/liquid interface: The principal problems include the __________________________ details of the crystallization process, as well as the transfer of magnetic energy across the interface. The precise nature of the solid and the liquid near a wall has a critical bearing on these questions and will also be studied. (3) Low density solid helium _________________________ three: In both bulk and constrained geometry, the investigators _____ propose a precision study of the anomalous susceptibility to test the polaron model and to investigate the relaxation induced by vacancies in general. Both the U.S. and French investigators have extensive research experience in the area of quantum fluids and solids, and in particular liquid and solid helium three. The results of this research will contribute to the understanding of the properties of quantum liquids and solids systems, which is of basic importance to condensed matter physics.