Spin Ordering and Transport in Correlated Electronic and Atomic Systems

相关电子和原子系统中的自旋排序和传输

• 批准号: 0804413
• 负责人: Joel Moore
• 金额: $ 28.5万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0804413&HistoricalAwards=false
• 关键词: Spin; Ordering; Transport; Correlated; Electronic

TECHNICAL SUMMARY:This award supports theoretical research and education on spin ordering and transport in correlated electronic and atomic systems. The PI will investigate problems in the collective spin physics of correlated electron materials and Bose-Einstein condensates of atoms with nonzero spin. The research is divided into three subfields: spin transport phenomena related to the new class of materials called ''topological insulators''; quantum effects on the phase ordering and coherent dynamics of spinor Bose condensates; applications of quantum information ideas to improved characterization and simulation of frustrated magnets. In each of these subfields, the research builds on the PI?s work performed under prior NSF support. The key elements in the first research area are to understand how correlation physics is modified in a topological insulator and to describe three dimensional topological insulators in greater depth. In the second area, the PI studies effects of topological defects and dipolar interactions on the quantum theory of Bose condensates with spin, as these are believed to be essential for the interpretation of experiments. In the third area, the research tests specific proposals for DMRG-like algorithms in dimension greater than one on frustrated magnetic models of current experimental interest.The work has broader impact beyond the specific research investigations including education and relevance to emerging device technologies. The work on spin transport in solids is currently of great interest in the applied semiconductor community, and devices using the quantum nature of electron spin are in development. The research is relevant to ideas of future use of spinor Bose condensates as ultrasensitive magnetic field detectors with spatial resolution finer than in the best existing devices with applications beyond MRI devices. Scientifically, improved algorithms to find ground states of local Hamiltonians are important in many areas of physics. This award has educational befits, the first being support of graduate students who will use the research as the basis for the Ph.D. Dissertation. The work influences the efforts of the PI in course development and undergraduate student research supervision within the university. With this award, the PI will continue development of on line educational materials with Lawrence Hall of Science as the major component of the outreach program, in conjunction with annual public lectures or panels for high school students.NONTECHNICAL SUMMARY:This award supports research and education on the recently discovered phenomena of electrical signals that are not associated with moving electrical charges, but rather associated with the seeming intrinsic rotation or spin that electron possess and the way groups of electrons transfer spin spatially. The phenomena are not unrelated to magnetism which also is connected to the intrinsic electron spin. The phenomena have been observed, but the theoretical explanation is less clear and the research seeks to clarify physical mechanisms and thereby add to the ability to control and utilize the phenomenon in device technology. Eventually, this may be the basis of electronic logic devices that are orders of magnitude faster and more efficient that the current transistor technology based on charge movement and charge accumulation.The work has broader impact beyond the specific research investigations including education and relevance to emerging device technologies. The work on spin transport in solids is currently of great interest in the applied semiconductor community, and devices using the quantum nature of electron spin are in development. The research is relevant to ideas of future use of spinor Bose condensates as ultrasensitive magnetic field detectors with spatial resolution finer than in the best existing devices with applications beyond MRI devices. Scientifically, improved algorithms are important in many areas of physics. This award has educational befits, the first being support of graduate students who will use the research as the basis for the Ph.D. Dissertation. The work influences the efforts of the PI in course development and undergraduate student research supervision within the university. With this award, the PI will continue development of on line educational materials with Lawrence Hall of Science as the major component of the outreach program, in conjunction with annual public lectures or panels for high school students.

该奖项支持相关电子和原子系统中自旋有序和输运的理论研究和教育。PI将研究相关电子材料和非零自旋原子的玻色-爱因斯坦凝聚体的集体自旋物理问题。该研究分为三个子领域：与称为“拓扑绝缘体”的新材料有关的自旋输运现象;旋量玻色凝聚体的相序和相干动力学的量子效应;量子信息思想在改进受抑磁体的表征和模拟中的应用。在这些子领域中的每一个，研究建立在PI？的工作下进行先前的NSF的支持。第一个研究领域的关键要素是了解拓扑绝缘体中的相关物理如何被修改，并更深入地描述三维拓扑绝缘体。在第二个领域中，PI研究拓扑缺陷和偶极相互作用对具有自旋的玻色凝聚体量子理论的影响，因为这些被认为是解释实验所必需的。在第三个领域，该研究测试了DMRG类算法的具体建议，尺寸大于当前实验兴趣的受挫磁模型。这项工作具有更广泛的影响，超出了具体的研究调查，包括教育和新兴设备技术的相关性。 固体中自旋输运的工作目前在应用半导体社区中引起了极大的兴趣，并且正在开发使用电子自旋的量子性质的设备。 这项研究与未来使用旋量玻色凝聚物作为超灵敏磁场探测器的想法有关，其空间分辨率比现有的最佳设备更精细，应用范围超出MRI设备。在科学上，改进的算法来寻找局域哈密顿量的基态在物理学的许多领域中是重要的。该奖项具有教育意义，首先是对研究生的支持，他们将使用研究作为博士学位的基础。论文。 这项工作影响了PI在大学课程开发和本科生研究监督方面的努力。 有了这个奖项，PI将继续开发在线教育材料与劳伦斯科学大厅作为推广计划的主要组成部分，结合每年的公开讲座或小组为高中生。非技术性总结：这个奖项支持的研究和教育的电信号，这是不与移动电荷，而是与表面上的内在旋转或自旋电子拥有和方式的电子转移自旋空间最近发现的现象。 这些现象与磁性不无关系，磁性也与内在电子自旋有关。 这些现象已经被观察到，但理论解释不太清楚，研究试图澄清物理机制，从而增加在设备技术中控制和利用这种现象的能力。最终，这可能是电子逻辑器件的基础，这些器件比目前基于电荷移动和电荷积累的晶体管技术快几个数量级，效率更高。这项工作的影响超出了具体的研究调查，包括教育和新兴器件技术的相关性。 固体中自旋输运的工作目前在应用半导体社区中引起了极大的兴趣，并且正在开发使用电子自旋的量子性质的设备。 这项研究与未来使用旋量玻色凝聚物作为超灵敏磁场探测器的想法有关，其空间分辨率比现有的最佳设备更精细，应用范围超出MRI设备。科学上，改进的算法在物理学的许多领域都很重要。该奖项具有教育意义，首先是对研究生的支持，他们将使用研究作为博士学位的基础。论文。 这项工作影响了PI在大学课程开发和本科生研究监督方面的努力。 有了这个奖项，PI将继续开发在线教育材料与科学的劳伦斯大厅作为推广计划的主要组成部分，与年度公开讲座或小组为高中学生。