MRI Consortium: Development of magneto-ellipsometer for the MET beamline of the National Synchrotron Light Source (NSLS-II), Brookhaven National Laboratory

由新泽西理工学院（NJIT）、哥伦比亚大学和国家同步加速器光源（NSLS-II）组成的一个联盟将在布鲁克海文国家实验室为先进的光学实验开发一种新的科学仪器。NSLS-II的MET光束线同步辐射将作为光源照亮样品。将分析从样品反射或通过样品透射的光的偏振，以确定样品的性质及其在外部磁场、低温和高静水压力施加的极端条件下的变化。新仪器将定性地提高对极端条件下材料行为的理解，并将促进纳米电子学和自旋电子学所需材料的发明。该仪器将提供给多所大学的研究小组，从而促进材料光谱学领域的进步。本项目的特色是将基础研究与本科生、研究生教育相结合，培养新一代科学仪器开发人员。由新泽西理工学院（NJIT）、哥伦比亚大学和国家同步加速器光源（NSLS-II）组成的一个联盟将开发一个多用户设备，用于在高磁场下进行低温椭偏和透射/反射偏振测量。该装置将安装在新的同步辐射源：布鲁克海文国家实验室（BNL）的NSLS-II的磁谱、椭圆偏振和时间分辨光学光谱（MET）光束线上。在10 cm-1和10,000 cm-1之间的光谱范围内，将提供全米勒矩阵光谱椭偏仪和偏振仪。该装置将具有高达7 T的磁场，并能够在相对于样品的磁场方向的准确法拉第和Voigt配置之间切换。MET的泵浦探测能力将集成在该装置中，以研究光诱导载流子引起的材料性质变化。在高静水压力下测量磁场反射率的光学器件也将包括在内。该仪器将促进旨在更好地理解量子材料中的低温和磁效应的研究活动，如单晶和多铁性薄膜、超导体和拓扑绝缘体，以及在磁电介质中非平凡光传播的相关领域。本项目的特色是将基础研究与本科生和研究生教育相结合，培养新一代科学仪器开发人员，并与国家科学研究院密切合作。该工具将通过NSLS-II的基于提案的一般用户访问系统提供给外部用户。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。

A consortium between New Jersey Institute of Technology (NJIT), Columbia U., and the National Synchrotron Light Source (NSLS-II) will develop a new scientific instrument for advanced optical experiments at Brookhaven National Laboratory. Synchrotron radiation at the MET beamline of NSLS-II will be used as a light source to illuminate samples. Polarization of the light that is reflected from or transmitted through the samples will be analyzed to determine the sample properties and their changes under extreme conditions imposed by the external magnetic field, low temperatures, and high hydrostatic pressure. The new instrument will qualitatively improve understanding of material behavior under extreme conditions and will facilitate invention of materials with desired properties for nanoelectronics and spintronics. This instrument will become available to research groups from multiple universities thus promoting the progress in the field of materials spectroscopy. Distinguishing features of this Project include the integration of fundamental research with the education of undergraduate and graduate students and training of the new generation of the scientific instrument developers. A consortium between New Jersey Institute of Technology (NJIT), Columbia U., and the National Synchrotron Light Source (NSLS-II) will develop a multi-User facility for low-temperature ellipsometry and transmission/reflection polarimetry in high magnetic fields. The setup will be installed at the new synchrotron radiation source: the Magnetospectroscopy, Ellipsometry and Time-Resolved Optical Spectroscopies (MET) beamline of NSLS-II, Brookhaven National Laboratory (BNL). Full Mueller matrix spectroscopic ellipsometry and polarimetry will be available in the spectral range between 10 cm-1 and 10,000 cm-1. The setup will have magnetic fields of up to 7 T with a capability to switch between the exact Faraday and Voigt configurations of the direction of the magnetic field with respect to the sample. The pump-probe capability at MET will be integrated in the setup to study changes of materials' properties induced by photo-induced carriers. Optics for reflectivity measurements under high hydrostatic pressure in the magnetic field will be also included. The proposed instrument will facilitate research activities aimed at better understanding low-temperature and magnetic effects in quantum materials, such as single crystals and thin films of multiferroics, superconductors, and topological insulators as well as in the related area of the non-trivial light propagation in magneto-electric media. Distinguishing features of this Project include the integration of fundamental research with the education of undergraduate and graduate students, training of the new generation of the scientific instrument developers, and their close collaboration with NSLS-II. The instrument will be offered to the external Users through the proposal-based General User access system at NSLS-II.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.