Neutron Scattering Experiments and Path Integral Monte Carlo Studies of Disordered Quantum Systems

无序量子系统的中子散射实验和路径积分蒙特卡罗研究

• 批准号: 9623961
• 负责人: Henry Glyde
• 金额: $ 12万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-07-15 至 1999-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623961&HistoricalAwards=false
• 关键词: Neutron; Scattering; Experiments; Path; Integral

w:\awards\awards96\*.doc 9623961 Glyde This is a joint experimental and theoretical research program, focusing on the elementary excitations of liquid helium in disordered environments and confined geometries. The aim is to investigate the effect of disorder and confinement on the fundamental physics of quantum fluids, with particular emphasis on superfluidity, Bose-Einstein condensation and disorder-driven localization. The experimental part consists of precision neutron scattering measurements on liquid helium in Vycor, aerogels and xerogels. The theoretical part, in parallel, will determine accurate path-integral Monte-Carlo simulations of realistic models of disordered liquid helium. %%% This is a joint experimental and theoretical research program, devoted to the study of quantum fluids in disordered environments. The goal is to gain understanding of the effect of disorder on microscopic physical phenomena relevant to materials science and technology. To this aim, the simplest quantum fluid, namely liquid helium, will be investigated experimentally in disordered systems such as Vycor, by means of precision neutron scattering measurements; in parallel, state-of-the art computer simulations on realistic models will be carried out. ***

w：\awards\awards96\*.doc 9623961 Glyde 这是一个联合实验和理论研究计划，重点是无序环境和受限几何形状中液氦的基本激发。目的是研究无序和限制对量子流体基本物理的影响，特别强调超流性，玻色-爱因斯坦凝聚和无序驱动的局部化。实验部分包括液氦在Vycor，气凝胶和干凝胶的精确中子散射测量。 理论部分，同时，将确定准确的 无序液态氦的真实模型的路径积分蒙特-卡罗模拟。 这是一个联合实验和理论研究计划，致力于 到 的 量子流体研究 在 无序的环境。目标是了解无序对材料科学和技术相关的微观物理现象的影响。为此，将通过精确的中子散射测量，在Vycor等无序系统中对最简单的量子流体，即液氦进行实验研究;同时，将对现实模型进行最先进的计算机模拟。 ***