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

MRI：获取低振动、无冷冻剂的低温恒温器显微镜系统

• 批准号: 1725335
• 负责人: Xiang Zhang
• 金额: $ 23.23万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1725335&HistoricalAwards=false
• 关键词: MRI; Acquisition; Low; Vibration; Cryogen

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.

非技术描述：该重大研究仪器项目支持在加州-伯克利大学获得低振动、无冷冻剂的测量系统，用于研究新兴的二维材料，如石墨烯和过渡金属二硫属化物。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，并提供对二维材料中电子的电荷和新的固有特性的精确控制。磁场、电接触和光激发的三重效应为探测这些新型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。与此同时，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级薄材料对社会产生积极影响，这些材料彻底改变了计算，电子和人类医疗保健的主要领域。技术描述：新兴的，原子级薄的石墨烯和过渡金属二硫属化物二维晶体提供了令人兴奋的机会，通过在原子尺度上工程量子现象来开发新型光电器件。由于二维材料的降维性，它们通过增强的多体相互作用和量子限制而表现出前所未有的性质。为了充分探索二维材料，研究人员必须了解电子，晶格声子和激子之间的相互作用在这种减少的维度。此次仪器收购所支持的研究涵盖材料科学、物理学和器件工程。利用低温下材料的磁场、电接触和光泵的新颖组合，可以揭示二维材料的临界量子行为和输运性质，这是开发谷型发光二极管、可穿戴压电发电机和可穿戴光学传感器等未来光电器件的关键。

项目成果

Observation of Rydberg exciton polaritons and their condensate in a perovskite cavity

• DOI: 10.1073/pnas.1909948116
• 发表时间: 2019-10-08
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Bao, Wei;Liu, Xiaoze;Zhang, Xiang
• 通讯作者: Zhang, Xiang