Exploration of Localization Phenomena at Ultra Thin Metal/ Semiconductor Interfaces: Going Beyond Surface Spectroscopies

超薄金属/半导体界面局域现象的探索：超越表面光谱

• 批准号: 9705246
• 负责人: Hanno Weitering
• 金额: $ 19.5万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-15 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705246&HistoricalAwards=false
• 关键词: Exploration; Localization; Phenomena; Ultra; Thin

9705246 Weitering The primary goal of this new research program is to explore the fundamentals of electron localization at crystalline semiconductor surfaces or in ultrathin epitaxial films. The PI who is a junior faculty member at Tennessee will measure the temperature dependence of the surface state conductance and attempt to correlate these classical transport measurements with state densities and band dispersions as measured with angle-resolved photoemission, electron energy loss spectroscopy and scanning tunneling spectroscopy. In addition, we will explore the possible formation of local magnetic moments using the a.c. susceptibility technique in ultrahigh vacuum. It is expected that this multi-technique approach will ultimately bridge the gap between surface science and mesoscopic physics, thereby generating a profound impact on both condensed matter physics and semiconductor technology. %%% The primary goal of this new research program is to explore the fundamentals of electron localization at crystalline semiconductor surfaces or in ultrathin epitaxial films. The trend toward miniaturization of industrial components is leading to materials that are so small as to be nearly two-dimensional. The smaller a sample, the more important its surface properties, simply because the surface represents a higher percentage of the sample. In order to learn something about surfaces, scientists have "bombarded" surfaces with quantum particles such as electrons or photons. Unfortunately, such experiments are extremely difficult to relate to practical matters such as electrical conductance. In this research project, we are exploring new ways to measure the electrical and magnetic properties of semiconductor surfaces and thin films directly. A novel method is being implemented to electrically insulate the surface from the bulk so that we can measure the electrical resistance o f the surface. We are also constructing a very sensitive nstrument capable of detecting extremely weak magnetic signals from a surface. It is expected that these new measurements will provide unprecedented insights that will help to bridge the gap between the physicist's world of atoms and molecules and the engineer's world of device fabrication. ***

小行星9705246 这项新研究计划的主要目标是探索晶体半导体表面或外延薄膜中电子局域化的基本原理。PI是田纳西州的一名初级教员，他将测量表面态电导的温度依赖性，并试图将这些经典的传输测量与状态密度和带色散相关联，如角分辨光电发射，电子能量损失谱和扫描隧道光谱测量。此外，我们将探讨可能形成的局部磁矩使用交流。真空磁化率技术预计这种多技术方法将最终弥合表面科学和介观物理之间的差距，从而对凝聚态物理和半导体技术产生深远的影响。 这个新研究计划的主要目标是探索晶体半导体表面电子局域化的基本原理 或 在外延薄膜中。 的 趋势 工业部件的小型化导致材料小到接近二维。样品越小，其表面特性越重要，因为表面占样品的百分比越高。 为了了解表面，科学家们用量子粒子（如电子或光子）“轰击”表面。不幸的是，这样的实验很难与诸如电导之类的实际问题联系起来。在这个研究项目中，我们正在探索新的方法来直接测量半导体表面和薄膜的电和磁特性。一种新的方法正在实施，以电绝缘的表面从散装，使我们可以测量的表面的电阻。 我们还在建造一种非常灵敏的传感器，能够探测到来自表面的极弱磁信号。预计这些新的测量将提供前所未有的见解，有助于弥合物理学家的原子和分子世界与工程师的器件制造世界之间的差距。 ***