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

9705246威特灵这一新研究计划的主要目标是探索电子在晶体半导体表面或超薄外延薄膜中局部化的基本原理。这位田纳西州初级教员将测量表面态电导的温度依赖关系，并尝试将这些经典输运测量与角分辨光电发射、电子能量损失光谱和扫描隧道光谱测量的态密度和能带色散相关联。此外，我们还将探索使用交流电磁场形成局部磁矩的可能性。超高真空磁化率技术。预计这种多技术方法最终将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都产生深远的影响。这个新研究计划的主要目标是探索电子在晶体半导体表面或超薄外延薄膜中局部化的基本原理。工业部件小型化的趋势正在导致材料变得如此之小，以至于几乎是二维的。样本越小，其曲面属性就越重要，这只是因为曲面在样本中所占的百分比较高。为了了解表面的一些情况，科学家们用电子或光子等量子粒子“轰击”表面。不幸的是，这样的实验很难与电导等实际问题联系起来。在这个研究项目中，我们正在探索直接测量半导体表面和薄膜的电磁性质的新方法。正在实施一种新的方法来将表面与本体电绝缘，以便我们能够测量表面的电阻。我们还在建造一种非常灵敏的仪器，能够检测来自表面的极弱的磁性信号。预计这些新的测量将提供前所未有的洞察力，有助于弥合物理学家的原子和分子世界与工程师的设备制造世界之间的差距。***

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. ***