Electrons in Two-Dimensional Systems

二维系统中的电子

• 批准号: 9402647
• 负责人: Arnold Dahm
• 金额: $ 36.5万
• 依托单位: Case Western Reserve University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-07-15 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9402647&HistoricalAwards=false
• 关键词: Electrons; Two; Dimensional; Systems

9402647 Dahm Technical abstract: The properties of electrons in two dimensions will be investigated using semiconductor heterostructures and electrons on helium films. Studies will be carried out in the variable-range hopping regime in gated heterostructures. A search will be made for a predicted Coulomb gap in the density of states. The magnetic field dependence of the localization length will be studied in an attempt to measure the energy of the "floating" delocalization states. The conduction properties of a pinned electron crystal on a liquid helium film will be carried out. This is a model sliding charge-density wave with a coupling to "impurities" (substrate potentials) which can be varied through a wide range by changing the film thickness. Non-technical abstract: The aim of this study is to achieve a better understanding of the laws of physics governing two- dimensional systems. The investigations span the spectrum of interest from a classical system of electrons on a helium surface to the quantum limit of electrons in semiconductors. The study of two-dimensional electrons in semiconductors is closely related to the 2D Hall effect and results from this study may have applications to electronic devices. Electrons on a helium surface form a model system to study properties of phenomena which occur in three dimensions within a more limited set of variables. ***

技术摘要：利用半导体异质结构和氦薄膜上的电子来研究电子的二维性质。研究将在门控异质结构的变范围跳变机制下进行。将在态密度中寻找预测的库仑间隙。为了测量“漂浮”离域态的能量，我们将研究局域化长度对磁场的依赖关系。研究了液氦薄膜上钉住电子晶体的导电特性。这是一个与“杂质”（衬底电位）耦合的滑动电荷密度波模型，它可以通过改变薄膜厚度在很大范围内变化。非技术摘要：这项研究的目的是为了更好地理解控制二维系统的物理定律。研究跨越了从氦表面的经典电子系统到半导体中电子的量子极限的兴趣范围。半导体中二维电子的研究与二维霍尔效应密切相关，本研究的结果可能应用于电子器件。氦表面上的电子形成一个模型系统，用于研究在更有限的一组变量内三维发生的现象的性质。＊＊＊