Mixed Bose - Fermi Superfluids and Fermi Liquid Transport in the Presence of Disorder

混合玻色-费米超流体和无序情况下的费米液体输运

• 批准号: 9970817
• 负责人: Jeevak Parpia
• 金额: $ 42.43万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2002-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9970817&HistoricalAwards=false
• 关键词: Mixed; Bose; Fermi; Superfluids; Liquid

Parpia9970817This low temperature physics research project seeks to create conditions under which He-3, a Fermi superfluid and He-4, a Bose superfluid coexist, interpenetrate and interact with each other. Such a coexistence and interpenetration of two distinct superfluid species does not occur in the bulk. The properties of Aerogel, a dilute space-filling glass impurity allow this new state of matter to be examined. In addition the project proposes to initiate the measurement of flow of normal 3He in aerogel. When the aerogel is sufficiently dense, the 3He should display characteristics similar to those observed in quantum transport in electron systems, while in the dilute limit, the flow should display a crossover from the Drude to Poiseuille flow behavior. These phenomena are important both from the fundamental physics viewpoint as well for potential applications. Flow generation and measurement techniques as well as the knowledge gained from the measurements will have applications in many fields. Graduate students receive training appropriate to careers in academia, industrial R & D, and the financial sector. Their familiarity with technical areas, ability to innovate, and to integrate new technology is highly sought after. %%%This low temperature research project concentrates on the effects of a very dilute glass (aerogel) on 3He. The aerogel introduces disorder into the 3He and allows another superfluid, 4He, to penetrate inside the core of the 3He superfluid. The project will look for coexistent superfluids and for interactions between the two distinct 4He and 3He superfluids. The esearcher will also examine in detail the effect of disorder on the flow of a quantum fluid. Why is this work at such an extreme low temperature important for the Nation? Quantum mechanical interference in electronic superconductors can be used to image weak magnetic fields, for example from activity in the brain. Quantum mechanical interference between two different species of superfluids has never been studied and could lead to new applications. The techniques needed to induce and measure flow in the quantum and conventional regimes as well as the understanding gained will have applications for flow in porous media. Areas such as oil field recovery, the management of aquifers, as well as the flow of biological fluids could benefit. Graduate students receive training appropriate to careers in academia, industrial R & D, and the financial sector. Their familiarity with technical areas, ability to innovate and manage a project from start to finish, as well as to integrate new technology is highly sought after.***

这个低温物理研究项目旨在创造条件，使费米超流体He-3和玻色超流体He-4共存，相互穿透和相互作用。两种不同超流体的共存和相互渗透在整体中是不会发生的。气凝胶是一种稀释的填充空间的玻璃杂质，它的特性使这种物质的新状态得以检验。此外，本课题拟开展气凝胶中正常3He流量的测量。当气凝胶足够致密时，3He应表现出与电子系统中量子输运相似的特征，而在稀释极限下，流动应表现出从德鲁德流到泊泽维尔流的交叉行为。这些现象无论是从基础物理学的观点还是从潜在的应用来看都是重要的。流量产生和测量技术以及从测量中获得的知识将在许多领域得到应用。研究生接受适合学术界、工业研发和金融部门工作的培训。他们对技术领域的熟悉、创新能力和整合新技术的能力受到高度追捧。这个低温研究项目集中于极稀玻璃（气凝胶）对3He的影响。气凝胶使3He变得无序，并允许另一种超流体4He进入3He超流体的核心。该项目将寻找共存的超流体以及两种不同的4He和3He超流体之间的相互作用。研究人员还将详细研究无序对量子流体流动的影响。为什么在如此低的温度下进行这项工作对国家很重要？电子超导体中的量子力学干扰可以用来成像弱磁场，例如大脑活动。两种不同超流体之间的量子力学干涉从未被研究过，可能会导致新的应用。在量子和常规状态下诱导和测量流动所需的技术以及所获得的理解将应用于多孔介质中的流动。油田开采、含水层管理以及生物流体流动等领域都可能受益。研究生接受适合学术界、工业研发和金融部门工作的培训。他们对技术领域的熟悉，创新能力和项目从头到尾的管理能力，以及整合新技术的能力都是非常受欢迎的