Experimental Study of Two Dimensional Electron Layers

[401561]技术摘要：氦衬底上的电子形成二维电子系统。该系统将在相图的一个区域进行研究，其中电子之间的相关性决定了平面内和平面外的动力学。实验的重点是(a)电子晶体的相边界以及筛选对其的影响；(b)垂直磁场存在下电子晶体与朗道量子化之间的相互作用；(c)晶体相关对隧穿的影响；(d)朗道量化对磁隧穿速率的影响。非技术摘要：在非常低的温度下，在氦薄层上捕获的电子形成了一个二维系统，可以作为研究凝聚态中更常规状态的电子状态的原型系统。实现在氦膜上聚集大量电子的情况所需的关键任务是显著减少沉积在氦膜上的底层固体的杂质和粗糙度。该项目将专注于利用超清洁和超光滑的固体衬底，以实现以前从未实现过的高密度电子。这种高电子密度将允许寻找尚未发现的效应，这些效应对氦电子问题尤其重要，而且对其他二维电子系统也很重要。＊＊＊

9401561 Andrei Technical abstract: Electrons on a helium substrate form a two dimensional electron system. This system will be investigated in a region of the phase diagram where correlations between electrons determine the in-plane and out-of-plane dynamics. The experiments focus on (a) the phase boundary of the electron crystal and how it is affected by screening; (b) the interplay between the electron crystal and Landau quantization in the presence of a perpendicular magnetic field; (c) the effects of crystal correlations on tunneling; (d) the effect of the Landau quantization on magneto-tunneling rates. Non-technical abstract: Electrons captured on a thin layer of helium at very low temperatures form a two dimensional system which can serve as a prototype system for the study of electron states in more conventional states of condensed matter. The key task required for realizing a case in which very many electrons are clustered on the helium film is to reduce significantly the impurities and roughness of the underlying solid on which the helium film is deposited. This project will focus on utilizing ultra clean and ultra smooth solid substrates in order to achieve such a high density of electrons which has not been previously achieved. This high electron density will allow search of as yet undiscovered effects which will be important to the electron on helium problem in particular, but also to other two dimensional electron systems in general. ***