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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：该主要研究仪器（MRI）开发项目旨在建立一个集成的显微拉曼-布里渊-曼德尔散射光谱仪系统，该系统具有在低温下保存样品的能力。拉曼散射和布里渊-曼德尔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（例如声子和磁振子）的能量。声子是晶格振动的量子，它与固体的声速有关，也在材料的电学、热学和光学现象中表现出来。磁振子是电子自旋波的量子，它决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特别重要。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。该项目为布里渊光谱仪器的发展提供了动力，并将其提升到目前拉曼光谱所享有的水平。光谱系统获得的信息有助于新材料的合成和表征，并有助于更好地了解其特性。该仪器增加了研究竞争力，提高了科学和工程教育在加州-滨江，这是一个认可的西班牙裔服务机构的大学。技术说明：显微拉曼-布里渊-曼德尔散射光谱仪系统的特点使其成为一个多用户设施，并使来自大学和工业界的科学和工程研究人员能够进行广泛主题的研究：从磁振子，声子和非平凡拓扑状态的尖端基础固态物理到复合材料弹性常数的工程测量。该系统的先进特点包括：（i）一个专门设计的旋转显微镜载物台和成像系统，用于测量温度范围从4 K到700 K的声子、磁振子和其他元素激发的能量色散;（ii）对具有原子厚度的样品具有高空间分辨率，磁振子的横向尺寸约为250 nm，声子的横向尺寸约为1 μ m;（iii）用于记录声子和磁振子能量的模量，该声子和磁振子能量基本上低于常规光谱仪的当前1-GHz极限;以及（iv）用于以高空间和时间分辨率同时激发和观察相干声子和磁振子的级。研究横向尺寸在微米范围内的原子薄膜的可能性使研究人员能够测量声学声子能量色散。该系统的能力提供了二维和一维材料中声子和磁振子的基本知识;磁性材料中磁振子-声子和自旋-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;以及新材料中其他准粒子的特性，该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的学术价值和更广泛的影响审查标准。