Electronic Properties of Metals and Semiconductors

该奖项支持理论凝聚态物理研究和教育，重点是基于金属的自旋电子学，以及包括量子霍尔效应在内的二维电子系统。研究将集中在磁性金属和半导体中与自旋相关的现象以及二维电子系统的物理学，包括量子霍尔效应。对磁性金属的研究将建立在这样一种想法的基础上，即当系统处于输运稳态而不是平衡态时，相互作用电子系统中准粒子的自能会发生变化，并且这些自能的变化可能是唯象的结果。铁磁金属中的自旋力矩提供了这种想法的一个例子，但PI计划探索许多其他的例子。一个推广是在反铁磁金属中输运电流驱动的序参量动力学。半导体磁性研究的动机是希望了解低载流子密度系统中铁磁转变温度的极限，以及寻求有用的新材料。这项研究计划的进展将建立在金属和半导体的现象学性质的知识，包括磁性，以及量子输运理论和量子多-在研究生和本科阶段的教育是交织在一个重要的方式与研究提供了一个平台，教育未来的科学家和工程师，将有助于技术知识国家的基础。将努力通过公开讲座和通过PI的网站与公众分享科学的兴奋。这些互动也将被用来帮助解释科学研究在我国和世界的至关重要性。这项研究可能会对半导体技术行业产生影响。基于该研究计划的见解将与工业联系人自由分享。该奖项支持指导代表性不足的学生和促进物理学界的多样性;该研究计划支持的女性和少数民族研究生将有助于建立一个更加多样化的物理研究社区。非技术概述：该奖项支持理论凝聚态物理研究和教育，重点关注磁性材料和有效限制在二维的材料中的电子可能表现出的令人兴奋的现象。由于其量子力学性质，电子具有自旋，这是角动量的固有量，就像它像陀螺一样旋转。材料的磁性从根本上与电子自旋有关。PI将开展基础研究，研究磁性半导体和磁性金属，旨在发现与电子自旋相关的新现象以及自旋如何在这些材料中移动。理解这些现象可能会导致存储，传输和操纵信息的新方法，以及不仅依赖于电子电荷进行操作而且依赖于自旋的新设备。磁性材料是实现自旋电子器件的关键。PI旨在进一步了解磁性半导体表现出磁性的最高温度的基本限制。PI还将对石墨（graphine）（本质上是一个二维石墨层）和包含有效限制在二维空间的电子的量子阱系统进行研究。PI将探索在这些系统中可能出现新的物质状态的可能性，这些系统表现出超导性或新的自旋相关现象。研究生和本科生教育与研究密切相关，研究为教育未来的科学家和工程师提供了一个平台，这将有助于国家的技术知识基础。将努力通过公开讲座和通过PI的网站与公众分享科学的兴奋。这些互动也将被用来帮助解释科学研究在我国和世界的至关重要性。这项研究可能会对半导体技术行业产生影响。基于该研究计划的见解将与工业联系人自由分享。该奖项支持指导代表性不足的学生和促进物理界的多样性;该研究计划支持的女性和少数民族研究生将有助于建立一个更加多样化的物理研究社区。

TECHNICAL SUMMARY:This award supports theoretical condensed matter physics research and education focusing on metals based spintronics, and on two-dimensional electron systems including the quantum Hall effect. Research will concentrate on spin related phenomena in magnetic metals and semiconductors and on the physics of two-dimensional electron systems including the quantum Hall effect. The research on magnetic metals will build on the idea that the self-energy of quasiparticles in an interacting electron system is modified when the system is in a transport steady state rather than an equilibrium state, and that these shifts in self-energy can be phenomenologically consequential.Spin torques in ferromagnetic metals provide one example of this idea, but the PI plans to explore many others. One generalization is to transport current driven order parameter dynamics in antiferromagnetic metals. The work on magnetism in semiconductors is motivated by the desire to understand limits on the ferromagnetic transition temperature in low-carrier density systems and by the quest for useful new materials. Progress with this research program will be built on knowledge of the phenomenological properties of metals and semiconductors, including magnetic properties, and on experience with the techniques of quantum transport theory and quantum many-body theory.Education at a graduate and undergraduate level is intertwined in an essential way with the research providing a platform for educating future scientists and engineers that will contribute to the technological knowledge base of the country. Efforts will be made to share the excitement of the science with the general public through public lectures and through the PI's web site. These interactions will also be used to help explain the critical importance of scientific research in our country and the world. The research may have impact on the semiconductor technology industry. Insights based on this research program will be shared freely with industrial contacts. This award supports mentoring underrepresented students and in fostering diversity in the physics community; female and minority Graduate students supported by this research program will contribute to building a physics research community that is more diverse.NON-TECHNICAL SUMMARY:This award supports theoretical condensed matter physics research and education focusing on exciting phenomena that may be exhibited by electrons in magnetic materials and in materials in which they are effectively confined to two dimensions. As a consequence of its quantum mechanical nature, an electron has spin, an intrinsic amount of angular momentum, as if it spins like a top. The magnetic properties of materials are fundamentally connected to the electron spin. The PI will carry out fundamental research to study magnetic semiconductors and magnetic metals with an aim to discovering new phenomena associated with electron spin and how spin moves through these materials. Understanding such phenomena may lead to new ways of storing, transmitting, and manipulating information, and to new devices that depend not only on the electron charge for their operation but also on their spin. Magnetic materials hold the key to enable the realization of spintronic devices. The PI aims to further understand fundamental limitations on the highest temperature at which magnetic semiconductors exhibit magnetism. The PI will also carry out research on graphine, essentially a two-dimensional layer of graphite, and on quantum well systems that contain electrons that are effectively confined to two dimensions. The PI will explore the possibility that new states of matter may occur in these systems that exhibit superconductivity or novel spin related phenomena. Education at a graduate and undergraduate level is intertwined in an essential way with the research providing a platform for educating future scientists and engineers that will contribute to the technological knowledge base of the country. Efforts will be made to share the excitement of the science with the general public through public lectures and through the PI's web site. These interactions will also be used to help explain the critical importance of scientific research in our country and the world. The research may have impact on the semiconductor technology industry. Insights based on this research program will be shared freely with industrial contacts. This award supports mentoring underrepresented students and in fostering diversity in the physics community; female and minority Graduate students supported by this research program will contribute to building a physics research community that is more diverse.