Novel Magnetism in II-Mn-VI Type-II Quantum Dots controlled by optical excitation

****技术摘要****本项目的研究将加深对ii型(II-Mn)-VI型量子点由光激发产生的新磁性的理解，并将探索通过光束控制磁性。在这些ii型量子点中最近发现的光学和磁性现象，以及理论合作者预测的有趣的可重入磁态将被研究。该研究项目涉及MBE的生长、结构、组成和磁性表征、连续波和时间分辨带间磁光谱学和太赫兹带内光谱的集成和单量子点柱，以及相关理论。这一努力将有助于更好地理解(II,Mn)-VI材料体系中这些II型柱状量子点的基本物理和材料问题。UB的pi将在其实验室中举办跨学科科学与工程伙伴关系（ISEP）支持的跨学科研究教师，目的是扩大将材料和固态物理研究与初中和高中课堂联系起来的机会。此外，在以往成功的基础上，将在赠款的第二个夏天进行为期一周的夏季研讨会，介绍磁现象及其在日常设备中的应用；该地区的高中教师将参加。****非技术摘要****本项目将探索利用光束控制纳米结构的磁性能。​pi将探索量子点中包含磁性离子（如锰）的新型磁性态。这些磁性量子点将作为光诱导、操纵和控制磁性的平台。这项工作将有助于更好地理解这些量子点系统的基本物理和材料问题。实验最终将集中在单个点列上，这是具有挑战性的，在这些系统中预计会发生大量有趣的物理现象，以及可能意想不到的发现。UB的pi将在其实验室中举办跨学科科学与工程伙伴关系（ISEP）支持的跨学科研究教师，目的是扩大将材料和固态物理研究与初中和高中课堂联系起来的机会。此外，在以往成功的基础上，将在赠款的第二个夏天进行为期一周的夏季研讨会，介绍磁现象及其在日常设备中的应用；该地区的高中教师将参加。

****Technical Abstract****The research in this project will develop improved understanding of novel magnetism created by optical excitation in type-II (II-Mn)-VI quantum dots, and will explore controlling magnetic properties by optical beams. Recently discovered optical and magnetic phenomena in these type-II quantum dots, as well as interesting re-entrant magnetic states predicted by theory collaborators will be investigated. The research program involves MBE growth, structural, compositional and magnetic characterization, CW and time-resolved interband magneto-optical spectroscopy and terahertz intraband spectroscopy of ensembles and single quantum dot columns, as well as associated theory. This effort will lead to a better understanding of the basic physics and materials issues of these type-II columnar quantum dots in the (II,Mn)-VI materials systems. The PIs at UB will host an Interdisciplinary Science and Engineering Partnership (ISEP) supported teacher in interdisciplinary research in their laboratories with the objective of expanding opportunities to link materials and solid state physics research to the middle and high school classroom. In addition, building on previous success, a one-week summer workshop in the second summer of the grant to provide an introduction to magnetic phenomena and their application to everyday devices will be conducted; high school teachers from the area will participate. ****Non-Technical Abstract****This project will explore controlling magnetic properties of nanostructures using optical beams. The research team involves two senior co-PIs and theory collaborators from the University at Buffalo, a co-PI at the University of Oklahoma and collaborators in MBE growth at the National Chiao Tung University, Taiwan. The PIs will explore novel magnetic states in quantum dots that incorporate magnetic ions such as manganese. These magnetic quantum dots will serve as platform for inducing, manipulating and controlling magnetism by light. The effort will lead to a better understanding of the basic physics and materials issues of these quantum dot systems. The experiments, which will ultimately focus on individual columns of dots, are challenging, and there is a great deal of interesting physics predicted to occur in these systems, as well as likely unanticipated discoveries. The PIs at UB will host an Interdisciplinary Science and Engineering Partnership (ISEP)-supported teacher in interdisciplinary research in their laboratories with the objective of expanding opportunities to link materials and solid state physics research to the middle and high school classroom. In addition, building on previous success, a one-week summer workshop in the second summer of the grant to provide an introduction to magnetic phenomena and their application to everyday devices will be conducted; high school teachers from the area will participate.