MRI: Development of a Cryogenic Integrated Micro-Raman-Brillouin-Mandelstam Spectrometer

MRI：低温集成微型拉曼-布里渊-曼德尔斯坦光谱仪的开发

基本信息

批准号：
2019056
负责人：
Alexander Balandin
金额：
$ 51.87万
依托单位：
University of California-Riverside
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-10-01 至 2024-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2019056&HistoricalAwards=false
关键词：
MRI Development Cryogenic Integrated Micro

项目摘要

Nontechnical Description:This major research instrumentation (MRI) development project aims to build an integrated micro-Raman-Brillouin-Mandelstam spectrometer system with a capability for samples held at cryogenic temperatures. Raman scattering and Brillouin-Mandelstam scattering are inelastic light scattering processes, which are used to measure energies of various types of elemental excitations, such as phonons and magnons, in solid materials. Phonons are quanta of crystal lattice vibrations, which are associated with sound velocities of solids and also reveal themselves in electrical, thermal and optical phenomena in materials. Magnons are quanta of electron spin waves, which determine characteristics of magnetic materials. The capability of conducting measurements at low temperatures is particularly important for studying magnetic materials. The spectral range and design of the spectrometer allow for its use for samples of small dimensions and thicknesses. The project provides an impetus to development of the Brillouin spectroscopy instrumentation, and its elevation to the level currently enjoyed by Raman spectroscopy. Information obtained with the spectroscopy system facilitates synthesis and characterization of new materials, and helps in better understanding of their properties. The instrument increases research competitiveness and enhances science and engineering education at the University of California - Riverside, which is an accredited Hispanic Serving Institution. Technical Description:The characteristics of the micro-Raman-Brillouin-Mandelstam spectrometer system make it a multi-user facility, and enable science and engineering researchers from universities and industry to conduct studies in a wide range of topics: from the cutting-edge fundamental solid-state physics of magnons, phonons and non-trivial topological states to engineering measurements of the elastic constants of composites. The advanced features of the system include (i) a specially designed rotating microscopy stage and imaging system for measuring the energy dispersion of phonons, magnons, and other elemental excitations in the temperature range from 4 K to 700 K; (ii) a high spatial resolution for the samples with the atomic thickness, lateral dimensions approximately 250 nanometers for magnons and about 1 micrometer for phonons; (iii) a modulus for recording phonon and magnon energies substantially below the current 1-GHz limit of conventional spectrometers; and (iv) a stage for simultaneous excitation and observation of coherent phonons and magnons with high spatial and temporal resolution. The possibility of investigating atomically-thin films with lateral dimensions in the micrometer range allows researchers to measure acoustic phonon energy dispersion. The capabilities of the system provide fundamental knowledge of phonons and magnons in two-dimensional and one-dimensional materials; the strength of the magnon-phonon and spin-lattice interactions in magnetic materials; elastic constants, phonon velocities and Gruneisen parameters in low-dimensional materials; charge density waves in quantum materials; as well as characteristics of other quasiparticles in novel materials, heterostructures and biological systems.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.

非技术描述：这项主要的研究仪器（MRI）开发项目旨在建立一个集成的微拉曼 - 布里林 - 曼德尔斯坦光谱仪系统，具有在低温温度下的样品的能力。拉曼散射和布里素 - 曼德尔斯坦散射是非弹性光散射过程，用于测量固体材料中各种类型的元素激发（例如声子和镁元子）的能量。声子是晶体晶格振动的量子，与固体的声速相关，并且在材料中的电气，热和光学现象中也揭示了自己。镁是电子自旋波的量子，它们确定了磁性材料的特性。在低温下进行测量的能力对于研究磁性材料尤为重要。光谱仪的光谱范围和设计允许其用于小尺寸和厚度的样品。该项目为Brillouin光谱仪器的开发提供了动力，并提高了拉曼光谱法当前所享有的水平。通过光谱系统获得的信息有助于新材料的合成和表征，并有助于更好地理解其性质。该工具提高了研究竞争力，并增强了加利福尼亚大学河滨分校的科学和工程教育，这是一家经过认可的西班牙裔服务机构。技术描述：微拉曼 - 布鲁林 - 曼德尔斯坦光谱仪系统的特征使其成为多用户的设施，并使大学和工业的科学和工程研究人员能够在广泛的主题中进行研究：从剪切的巨大质状固态物理学的剪裁基本固态物理学到工具量表的质量构造的质量量的质量质量和非事业状态。该系统的高级特征包括（i）特殊设计的旋转显微镜阶段和成像系统，用于测量温度范围为4 K至700 K的声子，镁质和其他元素激发的能量分散；（ii）具有原子厚度的样品的高空间分辨率，横向尺寸约250纳米的含量和声子约1千米；（iii）用于记录声子和亮棒能的模量基本低于当前1-GHz传统光谱仪的极限；（iv）同时激发和观察具有高空间和时间分辨率的相干声子和磁子的阶段。在千分尺范围内研究具有横向尺寸的原子薄膜的可能性使研究人员可以测量声子能量分散。该系统的功能提供了二维和一维材料中声子和磁子的基本知识；磁性材料中磁化碳和自旋晶格相互作用的强度；低维材料中的弹性常数，声子速度和Gruneisen参数；量子材料中的电荷密度波；以及其他准粒子在新颖材料，异质结构和生物系统中的特征。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响来通过评估来支持的。