Collaborative Research: Nanoscale Quantitative probing of Phase Transition in Correlated Rare-Earth Nickelates

合作研究：相关稀土镍酸盐相变的纳米级定量探测

• 批准号: 1904081
• 负责人: David Bahr
• 金额: $ 21.5万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1904081&HistoricalAwards=false
• 关键词: Collaborative; Research; Nanoscale; Quantitative; probing

Materials that undergo sharp transitions in their conductivity upon external stimulus represent an emerging class of semiconductors. These materials could affect future computing technologies and opto-electronic devices. Understanding the microscopic nature of the transitions is important to model their behavior. In this project, the PIs will collaboratively explore the role of atomic scale defects introduced by doping in controlling the conductivity and how it varies spatially within the material. This will be accomplished by combination of high-spatial resolution scanning probe microscopy that is sensitive to conductivity at the nanoscale and theoretical modeling of electrical conduction in the sample containing varying concentrations of such defects. In addition to research, the PIs will participate in educational and outreach activities including engaging high school students from diverse backgrounds in the Atlanta area to participate in physics research.Perovskite nickelates undergo insulator-metal transitions that can be modulated by external stimuli such as temperature, pressure as well as growth protocols. Microscopic understanding of the phase transition with emphasis on scanning probe techniques will be accomplished by using integrated high-resolution experimental nanoscale near-field imaging and spectroscopy techniques covering infrared to THz, theoretical calculations and Monte Carlo Simulations. The research will impact electronic and optical materials engineering and devices, fundamental physics, and materials science. The results will enable fundamental quantitative understanding of the first order phase transition of correlated oxides at high-spatial resolution and will have a significant impact on future electronics and photonics, sensing, neuromorphic devices. The research and integrated education plan will promote undergraduate and graduate materials and nano-optoelectronic education in the Athens/Atlanta area. The work throughout this research will provide participating students, including those from underrepresented groups, with advanced multidisciplinary skills to tackle challenging condensed matter/materials physics problems. The project will include development of new courses, undergraduate research and advising and provide travel fellowships for students from other institutions to attend Workshops. The PIs will integrate research into outreach activities for high school physics teacher(s)/students' education and training as well as community outreach that targets African immigrant students/families and African American youth in the Athens/Atlanta area.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.

在外界刺激下电导率发生急剧变化的材料是一类新兴的半导体。这些材料可能会影响未来的计算技术和光电设备。理解这些转变的微观本质对于模拟它们的行为是很重要的。在这个项目中，pi将合作探索由掺杂引入的原子尺度缺陷在控制电导率中的作用，以及它在材料中的空间变化。这将通过结合对纳米级电导率敏感的高空间分辨率扫描探针显微镜和含有不同浓度此类缺陷的样品中的电导率的理论建模来完成。除了研究之外，pi还将参与教育和推广活动，包括吸引亚特兰大地区不同背景的高中生参与物理研究。钙钛矿镍酸盐经历绝缘体-金属转变，这种转变可以通过外部刺激（如温度、压力和生长方案）来调节。通过集成高分辨率实验纳米级近场成像和光谱技术，包括红外到太赫兹波段，理论计算和蒙特卡罗模拟，将重点放在扫描探针技术的相变微观理解上。这项研究将影响电子和光学材料工程与器件、基础物理学和材料科学。该结果将使我们能够在高空间分辨率下对相关氧化物的一阶相变进行基本的定量理解，并将对未来的电子和光子学、传感、神经形态器件产生重大影响。该研究和综合教育计划将促进雅典/亚特兰大地区的本科和研究生材料和纳米光电教育。整个研究的工作将为参与的学生，包括那些来自代表性不足的群体的学生，提供先进的多学科技能，以解决具有挑战性的凝聚态物质/材料物理问题。该项目将包括开发新课程、本科生研究和咨询，并为其他院校的学生提供参加研讨会的旅行奖学金。pi将把研究纳入高中物理教师/学生的教育和培训外展活动，以及针对雅典/亚特兰大地区的非洲移民学生/家庭和非洲裔美国青年的社区外展活动。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Switching Dynamics in Vanadium Dioxide-Based Stochastic Thermal Neurons

二氧化钒基随机热神经元的开关动力学

• DOI: 10.1109/ted.2022.3168248
• 发表时间: 2022
• 期刊: IEEE Transactions on Electron Devices
• 影响因子: 3.1
• 作者: Yu, Haoming;Islam, A. N.;Mondal, Sandip;Sengupta, Abhronil;Ramanathan, Shriram
• 通讯作者: Ramanathan, Shriram

Effective reduction of PdCoO2 thin films via hydrogenation and sign tunable anomalous Hall effect

通过氢化和符号可调反常霍尔效应有效还原 PdCoO2 薄膜

• DOI: 10.1103/physrevmaterials.5.l052001
• 发表时间: 2021
• 期刊: Physical Review Materials
• 影响因子: 3.4
• 作者: Rimal, Gaurab;Schmidt, Caleb;Hijazi, Hussein;Feldman, Leonard C.;Liu, Yiting;Skoropata, Elizabeth;Lapano, Jason;Brahlek, Matthew;Mukherjee, Debangshu;Unocic, Raymond R.
• 通讯作者: Unocic, Raymond R.

Electron doping of NdNiO3 thin films using dual chamber CaH2 annealing

• DOI: 10.1016/j.jssc.2022.123512
• 发表时间: 2022-08
• 期刊: Journal of Solid State Chemistry
• 影响因子: 3.3
• 作者: D. K. Amarasinghe;Haoming Yu;F. Rodolakis;Hua Zhou;Hui Cao;S. Ramanathan