Monolayer Physics

该计划侧重于所谓的“量子流体和固体”(分子氢；原子氦及其混合物)的薄膜(一到几层厚)的热力学性质，这些薄膜形成在干净、特征非常好的衬底的固体表面上。讨论的具体主题包括分子氢在单层中的凝固，以寻找低温液体相和可能的超流性；在单层中吸附在氢上的氦4的液体冷凝；氦3在方对称衬底上的流体行为；多孔介质中的界面熔化；以及新衬底的开发。%这个程序研究吸附现象，因为它适用于量子流体，以及通过将它们约束到薄层而引起的流体性质的改变。除了促进他们对这些非常不寻常的流体的理解外，这项工作还提供了在超流体领域发现新现象的可能性。

The program focuses on the thermodynamic properties of films (one to several layers thick) of the so-called "quantum fluids and solids" (molecular hydrogens; atomic heliums and their mixtures), formed on the solid surface of clean, very well characterized substrates. Specific topics addressed include solidification of molecular hydrogen in a monolayer, to search for a low-temperature liquid phase and possible superfluidity; liquid condensation of helium 4 adsorbed on hydrogen in a monolayer; fluid behavior of helium 3 on a substrate of square symmetry; interfacial melting in porous media; and the development of new substrates. %%% This program studies the phenomenon of adsorption as it applies to quantum fluids and the modification of the fluid properties occasioned by constraining them to thin layers. Beyond advancing their understanding of these very unusual fluids, the work offers the possibility of discovering new phenomena in the area of superfluids.