Collaborative Research: Coherent Spin Dynamics of Electrons, Ions and Nuclei in Confined Geometries

合作研究：受限几何中电子、离子和原子核的相干自旋动力学

• 批准号: 0305223
• 负责人: David Awschalom
• 金额: $ 65万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0305223&HistoricalAwards=false
• 关键词: Collaborative; Research; Coherent; Spin; Dynamics

This proposal is a collaborative experimental effort that explores the coherent spin dynamics of electrons, ions and nuclear spins in low dimensional systems that confine electrons and/or photons. The proposed experiments focus on model nanostructures fabricated from both conventional and magnetic II-VI and III-V semiconductors and exploit the unique opportunities offered by such systems to systematically tailor spin interactions between confined electronic states, magnetic ions, and nuclei. The project combines state-of-the-art spin dynamical probes having high temporal (~100 fs) and spatial (~100 nm) resolution with sophisticated materials engineering of a variety of semiconductor-based structures whose dimensions span the nano- to the mesoscale. The overall thrust of this research program is to develop a fundamental understanding of the control, transport and storage of coherent spin phenomena in semiconductors via optical experiments that probe spatio-temporal spin transport in heterostructures, coherent spin control in optical microcavities, coherent nuclear spin dynamics in isotopically-engineered nanostructures, and coherent spin excitations in mesoscopically patterned ferromagnets. These experiments potentially have a broad and long range impact on future technologies that explicitly use quantum phenomena for new functionality. The research provides students with advanced technical training in leading edge materials engineering and condensed matter techniques. The principal investigators will disseminate the results of their scientific activity to the general public, and continue to attract a diverse and talented student base. A fundamental understanding of the transport, storage and manipulation of coherent spin states in semiconductors is important for the future development of quantum information science and technology. Contemporary materials fabrication techniques offer access to important model systems in this context by enabling the systematic tailoring of spin interactions between confined electronic/photonic states and magnetic ions/nuclei. This collaborative proposal is aimed at using ultrafast and high-spatial resolution optical techniques to probe coherent electronic, ionic and nuclear spin dynamics in a variety of semiconductor-based architectures with dimensions spanning from the nano- to the mesoscale. The project will address basic issues such as coherent spin transport in complex heterostructures, coherent spin control in optical microcavities, coherent nuclear spin dynamics in isotopically-engineered nanostructures, and coherent spin excitations in ferromagnetic semiconductor nanostructures. It is anticipated that this project will result in important fundamental insights into questions that are at the very forefront of condensed matter physics and simultaneously have a broad and long range impact on future technologies that explicitly use spintronics or quantum phenomena for new functionality. The research provides students with technically sophisticated training in the synthesis of semiconductor and magnetic nanostructures, ultrafast optical spectroscopy, low temperature transport, and micromagnetometry, and is hence an ideal training ground for both academic and industrial environments. The principal investigators will disseminate the results of their scientific activity to the general public, and continue to attract a diverse and talented student base.

这一提议是一项合作的实验工作，旨在探索电子、离子和核自旋在限制电子和/或光子的低维系统中的相干自旋动力学。拟议的实验重点是用传统的和磁性的II-VI和III-V半导体制造的模型纳米结构，并利用这种系统提供的独特机会来系统地定制受限电子态、磁性离子和原子核之间的自旋相互作用。该项目将具有高时间(~100 ms)和空间(~100 nm)分辨率的最先进的自旋动力学探测器与各种基于半导体的结构的复杂材料工程相结合，这些结构的尺寸从纳米到介观。这一研究计划的主要目的是通过光学实验对半导体中相干自旋现象的控制、输运和存储有一个基本的了解，这些实验探索异质结构中的时空自旋输运，光学微腔中的相干自旋控制，同位素工程纳米结构中的相干核自旋动力学，以及介观图案化铁磁体中的相干自旋激发。这些实验可能会对未来明确使用量子现象实现新功能的技术产生广泛而长期的影响。该研究为学生提供前沿材料工程和凝聚态技术方面的高级技术培训。主要研究人员将向公众传播他们的科学活动结果，并继续吸引多样化和有才华的学生基础。对相干自旋态在半导体中的输运、存储和操纵有一个基本的了解，这对于量子信息科学和技术的未来发展具有重要意义。现代材料制备技术通过系统地定制受限电子/光子态和磁性离子/原子核之间的自旋相互作用，提供了在这一背景下访问重要模型系统的途径。这一合作提议的目的是使用超快和高空间分辨率的光学技术来探测各种基于半导体的体系结构中的相干电子、离子和核自旋动力学，其维度从纳米到介观。该项目将解决基本问题，如复杂异质结构中的相干自旋输运，光学微腔中的相干自旋控制，同位素工程纳米结构中的相干核自旋动力学，以及铁磁半导体纳米结构中的相干自旋激发。预计该项目将对处于凝聚态物理最前沿的问题产生重要的基础性见解，同时对明确使用自旋电子学或量子现象实现新功能的未来技术产生广泛和长期的影响。这项研究为学生提供了半导体和磁性纳米结构的合成、超快光学光谱、低温传输和微磁测量方面的复杂技术培训，因此是学术和工业环境的理想培训基地。主要研究人员将向公众传播他们的科学活动结果，并继续吸引多样化和有才华的学生基础。