MRI: Acquisition of a Low-Vibration, Cryogen-Free Cryostat Microscope System

非技术描述：该主要研究仪器项目支持在加州大学伯克利分校获得一个低振动，无低温测量系统，用于研究新兴的二维材料，如石墨烯和过渡金属二硫族化合物。该系统能够在大磁场下高精度地进行材料特性的光学和电学测量，并能精确控制二维材料中的电荷和电子的新固有特性。磁场、电接触和光激发的三重作用为探索这些新材料的量子现象以及探索其光电应用提供了新的研究机会。同时，该系统为建立新的合作、学生培训和劳动力发展提供了一个平台。该研究通过开发新的原子薄材料对社会产生积极影响，这些材料将彻底改变计算、电子和人类医疗保健的主要领域。技术描述：石墨烯和过渡金属二硫族化合物的原子薄二维晶体的出现，为在原子尺度上通过工程量子现象开发新型光电器件提供了令人兴奋的机会。由于二维材料的降维性，二维材料通过增强的多体相互作用和量子约束获得了前所未有的性能。为了充分探索二维材料，研究人员必须了解在这种降维中电子、晶格声子和激子之间的相互作用。该仪器的获取使研究跨越了材料科学、物理和设备工程。通过低温下材料的磁场、电触点和光泵浦的新组合，可以揭示二维材料的关键量子行为和输运性质，这是开发未来光电器件如谷发光二极管、可穿戴压电发生器和超薄光学传感器的关键。

Non-Technical Description:This Major Research Instrumentation project supports the acquisition of a low-vibration, cryogen-free measurement system at the University of California - Berkeley for studying emerging two-dimensional materials such as graphene and transition metal dichalcogenides. The system enables optical and electrical measurements of materials properties with high precision under large magnetic fields, and offers precise control of charge and novel intrinsic properties of electrons in the two-dimensional materials. The trifecta of magnetic field, electrical contacts, and optical excitation offers new research opportunities for probing the quantum phenomena of these novel materials as well as exploring their optoelectronic applications. In the meanwhile, the system provides a platform for forging new collaborations, student training and workforce development. The research positively impacts society through the development of new atomically-thin materials that revolutionize major areas of computing, electronics and human healthcare.Technical Description:The emerging, atomically-thin two-dimensional crystals of graphene and transition metal dichalcogenides offer exciting opportunities to develop novel optoelectronic devices by engineering quantum phenomena at the atomic scale. Owing to their reduced dimensionality, two-dimensional materials process unprecedented properties through their enhanced many-body interactions and quantum confinement. To fully explore two-dimensional materials, researchers must understand the interplay among the electrons, lattice phonons, and excitons in such reduced dimensions. The research enabled by this instrument acquisition spans materials science, physics and device engineering. With a novel combination of magnetic field, electrical contacts, and optical pump of materials at low temperatures, the critical quantum behaviors and transport properties of two-dimensional materials can be revealed, which is the key to developing future optoelectronic devices such as valley light-emitting diode, wearable piezoelectric generator, and ultrathin optical sensors.