Physics of Strongly Correlated Two Dimensional Electron Systems

这是一个凝聚态物理实验项目，旨在提高我们对先进半导体异质结中二维电子系统集体行为的理解。人们的注意力将集中在高磁场和极低温度下的电传输、量子隧道和库仑阻力测量上。这些探针将被应用于新发现的高激发朗道能级中的多电子态，以及双层系统中二维电子所表现出的显着的铁磁组态。这些实验的结果将有助于阐明潜在的结构(如相关液体、电荷密度波等)。这些不寻常的物质阶段。由于量子多体问题是现代凝聚态物理的核心，计划中的研究将具有广泛的意义。先进的晶体生长对材料科学的积极影响也是可以预期的，因为只有最纯的半导体样品才适合进行这项研究。这项研究为接受学术、行业或政府职业培训的研究生和博士后助理提供了极好的教育机会。他们的工作涉及基础物理以及接触尖端材料和仪器。这个实验凝聚态物理项目旨在提高对具有重要技术意义的半导体材料中大电子群行为的基本理解。计划中的研究将有几个结果：首先，将阐明电子系统本身的基本性质。注意力将集中在这些方面，这些方面严重依赖于电子对彼此施加的排斥力。这个“多体问题”是现代凝聚态科学的核心。其次，这项研究将推动材料科学的前沿。这项工作所需的样品需要最先进的晶体生长方法来制造，最终必须具有非常高的纯度和复杂性。这些同样的生长方法被用来制造各种技术上重要的器件，从用于蜂窝电话的快速晶体管到用于光盘播放器的激光。这项研究具有很强的教育成分，将有助于提高国家的技术竞争力。

This is a condensed matter physics experimental project aimed at improving our understanding of the collective behavior of two-dimensional electron systems in advanced semiconductor heterostructures. Attention will be focused on electrical transport, quantum tunneling, and Coulomb drag measurements at high magnetic field and very low temperature. These probes will be applied to the newly discovered many-electron states in highly excited Landau levels and to the remarkable ferromagnetic configurations that two-dimensional electrons in double layer systems exhibit. The results of these experiments will help to elucidate the underlying structure (e.g. correlated liquid, charge density wave, etc.) of these unusual phases of matter. As the quantum many-body problem is at the heart of modern condensed matter physics, the planned research will have broad significance. A positive impact on the materials science of advanced crystal growth can also be expected since only the very purest semiconductor samples are suitable for this research. The research provides excellent educational opportunities for graduate students and post-doctoral associates who be trained for careers in academe, industry or government. Their work involves fundamental physics and exposure to cutting edge materials and instrumentation.%%%This experimental condensed matter physics project is aimed at improving the basic understanding of how large groups of electrons behave in technologically important semiconductor materials. The planned research will have several outcomes: First, the fundamental properties of the electron systems themselves will be elucidated. Attention will be focussed on those aspects that depend critically on the repulsive forces the electrons exert upon one another. This "many-body problem" is at the core of modern condensed matter science. Second, this research will advance the frontiers of materials science. The samples needed for this work require the most advanced methods of crystal growth for their fabrication and, in the end, must be of the very highest purity and complexity. These same growth methods are used to fabricate a wide variety of technologically important devices, ranging from fast transistors for cellular telephones to lasers for compact disk players. This research has a strong educational component and will contribute to the Nation's technological competitiveness.