Quantum Fluids at Low Temperatures: 2D and Dilute Bose Gas Studies

9971124代表这是一个凝聚态物理项目，它与氦-4薄膜中的玻色-爱因斯坦凝聚(BEC)有关。该项目是对最近在碱蒸气和自旋极化氢原子气体系统中的BEC演示的补充。对吸附在多孔Vycor玻璃3D连接衬底上的氦的稀玻色气体状态的研究为捕获原子气体系统提供了一个有价值的替代方案。Vycor系统中的He-4允许获得广泛的粒子密度，从稀薄玻色气体区域到高密度、强相互作用区域，这是原子气体系统目前无法获得的区域。最初的项目将是研究转变温度随着密度的增加而变化。参与该项目的研究生受益于接触激动人心的基础物理研究和最先进的仪器设备的经验。为各行各业提供出色的培训。这是一个凝聚态物理项目。玻色爱因斯坦凝聚(BEC)在受限于电磁陷阱的低密度原子气体中的演示在科学界引起了极大的兴奋。在这里提出的工作中，将研究一种替代BEC的方法，利用低密度吸附在多孔衬底Vycor玻璃表面的4He原子。在很低的温度下，原子的量子波长变得相当于可移动原子之间的分离，从而发生了BEC现象。在4He-Vycor系统中进行BEC研究的一个真正的优势是，粒子密度可以在从非常低的密度区域到可与大块超流氦相当的高密度的整个范围内调节。参与该项目的研究生受益于接触激动人心的基础物理研究和最先进的仪器设备的经验。为各行各业提供出色的培训。*

9971124ReppyThis is a condensed matter physics project that is concerned with the Bose-Einstein condensation (BEC) in the context of films of Helium-4. The project is complementary to the recent demonstration of the BEC in the atomic gas systems of alkali vapor and spin polarized hydrogen. The study of the dilute Bose gas regime for helium adsorbed on the 3D connected substrate of porous Vycor glass provides a valuable alternative to the systems of trapped atomic gas. The He-4 in Vycor system allows access to a wide range of particle densities, ranging from the dilute Bose gas regime to the high-density, strongly-interacting regime, a regime that is currently inaccessible to the atomic gas systems. An initial project will be to examine the variation of transition temperature with increasing density. Graduate students participating in the project benefit from exposure to exciting fundamental physics research and experience with state-of-the-art instrumentation. The provides excellent training for a wide range of careers. %%%This is a condensed matter physics project. The demonstration of Bose Einstein Condensation (BEC) in low density atomic gases confined to electromagnetic traps has created great excitement in the scientific community. In the work proposed here, an alternative approach to BEC will be investigated utilizing 4He atoms adsorbed at low density on the surface of a porous substrate, Vycor glass. At very low temperatures the quantum wavelength of the atoms becomes comparable to the separation between the mobile atoms and the phenomena of BEC occurs. A real advantage to BEC studies in the 4He-Vycor system, is that the particle density can be tuned over the entire range from the very low density regime to high densities comparable to bulk superfluid helium. Graduate students participating in the project benefit from exposure to exciting fundamental physics research and experience with state-of-the-art instrumentation. The provides excellent training for a wide range of careers.***