Tuning Plasmonic and Magneto-Plasmonic Behavior in 4-d Transition Metal Doped Indium Oxide

将提供电子的原子并入金属氧化物纳米晶体中会产生新的特性。 这些金属氧化物对光学、电子学、量子计算和柔性电子学都很重要。计算，合成和光学技术将用于控制光（光子）和电子在磁场中的相互作用。在金属氧化物半导体内有意放置磁性和电子供给原子将导致使用光有意控制金属氧化物内的载流子密度的能力。 光会使电子振荡。 这种振荡将允许电子与磁场耦合，为量子计算提供材料。供体原子的选择、浓度及其在电子束中的位置控制了用于耦合电子的光的颜色。这项工作将培养学生在电子和光子材料的最前沿。将为来自大学的本科生建立一个合作教育经验，重点是代表性不足的学生。将与佛罗里达州立大学和合作学校的研究人员通过远程学习共同探索电子和光子材料的研究，金属氧化物半导体量子点中费米能级附近载流子迁移率和密度的变化将产生涌现的等离子体和磁等离子体特性。这些变化取决于尺寸和部位（核心与表面）。该研究解决了关于等离子体量子点（QD）的三个普遍问题，1）当将4d n型供体并入In_2O_3 QD中时，是否会观察到等离子体响应，以及有效质量是否会作为4d能级的函数被系统地调谐？2)供体位点位置对异价掺杂剂的等离子体激元激活或失活的作用是什么？以及3）电子和磁性共掺杂的量子点的电子和磁性是否可以耦合？目的1询问载流子密度和载流子迁移率的影响所产生的4D施主轨道能级相对于导带底（CBM）在In 2 O3。预期等离子体响应对于Mo将是I型，对于Nb将是II型，并且对于Zr供体将是III型。在目标2中，将使用与光学方法相关的固态魔角旋转（MAS）NMR技术来评估载流子密度的测量和供体掺入位点的影响。该目标将评估的预测，在费米能级的载流子密度和等离子体激元的性质主要来自掺杂剂内的QD的核心。在目标3中，Sn，Cr：In 2 O3中的磁交换相互作用的扰动将被研究用于共结合电子（n-供体）和顺磁性（Cr（III））供体的系统。该目标将测试的计算假设，耦合的磁交换和等离子体激元功能可以出现浅捐助者。实验和计算建模方法（密度场理论）的应用将导致在这些新材料中产生新的等离子体和磁等离子体响应的合理设计标准的发展。这些活动将培养处于研究前沿的学生，并为各级学生发展教育和研究基础设施。将建立一个利用远程学习战略的研究合作，以加强北格鲁吉亚大学和佛罗里达A M大学本科研究人员的教育经验。远程学习方法包括远程访问仪器和远程会议与主要研究者审查研究业绩和结果。这项工作被称为等离子体军队和使用远程学习策略，以分享研究和提高学习成果的本科生有兴趣在先进的研究活动领域通常没有发现在一个小的大学。这个奖项反映了NSF的法定使命，并已被认为是值得通过评估使用基金会的智力价值和更广泛的影响审查标准的支持。

Incorporation of atoms that donate electrons into metal oxide nanocrystals leads to new properties. These nanocrystal metal oxides are important for optics, photocatalysis, quantum computing, and flexible electronics. Computational, synthetic, and optical techniques will be employed to control the interaction of light (photons) and electrons in a magnetic field. The intentional placement of magnetic and electron donating atoms within a metal oxide nanocrystal will lead to an ability to intentionally control carrier densities within the metal oxide using light. Light will cause the electrons to oscillate. This oscillation will allow the electrons to be coupled with a magnetic field providing a route to materials for quantum computing. The choice of the donor atom, its concentration, and its location within the nanocrystal controls the color of the light used to couple the electrons. The effort will train students at the forefront of electronic and photonic materials. A collaborative educational experience for undergraduate students from universities focused on underrepresented students will be established. Research into electronic and photonic materials will be explored jointly with the investigators at Florida State University and the collaborative schools through distance-learning.Emergent plasmonic and magneto plasmonic properties will arise from changes in carrier mobility and densities near the Fermi level in metal oxide semiconductor quantum dots. The changes are size and site (core vs. surface) dependent. The research addresses three prevailing questions in regards to plasmonic quantum dots (QDs), 1) Will a plasmonic response be observed when 4d n-type donors are incorporated into In2O3 QDs and will the effective mass be systematically tuned as a function of 4d energy level? 2) What is the role of donor site location on the plasmonic activation or deactivation of an aliovalent dopant? and 3) Can the electronic and magnetic properties for QDs co-doped with electronic and magnetic dopants be coupled? Aim 1 interrogates the impact on carrier densities and carrier mobilities arising from the 4d donor orbital energy levels relative to the conduction band minimum (CBM) in In2O3. It is anticipated the plasmonic response will be Type I for Mo, Type II for Nb, and Type III for Zr donors. In Aim 2, measurement of the carrier densities and the influence of site of donor incorporation will be evaluated using solid-state magic angle spinning (MAS) NMR techniques correlated with optical methods. The aim will evaluate the prediction that the carrier density at the Fermi level and plasmon properties arise primarily from dopants within the core of the QD. In Aim 3, perturbation of magnetic exchange interactions in Sn,Cr:In2O3 will be investigated for a system co-incorporating an electronic (n-donor) and a paramagnetic (Cr(III)) donor. The aim will test the computational hypothesis that coupling of the magnetic exchange and plasmonic features can arise for shallow donors. The application of experimental and computational modeling methods (density field theory), will lead to the development of rational design criteria for producing new plasmonic and magneto-plasmonic responses in these new materials. The activities will train students at the forefront of research and develops the educational and research infrastructure for students at all levels. A research collaboration using distance-learning strategies will be established to enhance the educational experience of undergraduate researchers from University of North Georgia and Florida A&M University. The distance learning approach includes remote access to instrumentation and remote meetings with the principle investigator to review research performance and results. The effort is termed the Plasmonic Army and uses distance learning strategies to share research and to improve the learning outcome for undergraduates interested in advanced research activities in areas typically not found at a small University.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.