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

格莱德这是一个实验和理论联合研究项目，重点研究无序环境和受限几何条件下液氦的初等激发。目的是研究无序和约束对量子流体基本物理的影响，特别强调超流动性、玻色-爱因斯坦凝聚和无序驱动的局域化。实验部分包括对Vycor、气凝胶和干凝胶中液氦的精确中子散射测量。理论部分，同时，将确定精确的路径积分蒙特卡罗模拟的现实模型的无序液氦。这是一个实验和理论联合研究项目，致力于研究无序环境中的量子流体。目标是了解无序对与材料科学和技术相关的微观物理现象的影响。为此目的，最简单的量子流体，即液氦，将在无序系统（如Vycor）中通过精确的中子散射测量进行实验研究；同时，将在现实模型上进行最先进的计算机模拟。＊＊＊

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. ***