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Correlated states in graphene heterostructures

石墨烯异质结构中的相关态

基本信息

批准号：
1708406
负责人：
Brian LeRoy
金额：
$ 42.72万
依托单位：
University of Arizona
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：
2017-06-01 至 2021-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1708406&HistoricalAwards=false
关键词：
Correlated states graphene heterostructures

项目摘要

Non-technical AbstractThe control of electronic degrees of freedom in nanomaterials is essential for the emergence of new phenomena. Recently, many atomically thin materials have been realized that each offer unique properties ranging from superconductors to semiconductors and insulators. By combining these atomically thin materials in vertical heterostructures, new electronic properties are expected to emerge. Spatially resolved probes offer a unique opportunity for precision measurement and control of the electronic properties of these two dimensional materials. These probes have the ability to measure the orientation of the materials and the interactions between them. These quantities ultimately determine the type of states that can be created in the heterostructures. The results obtained in this proposal will lead to the development of novel electronic devices, such as transistors, photodetectors and sensors. The proposed program will provide training for graduate students as well as enable undergraduate students from underserved groups to participate in research through the Arizona Science, Engineering, and Mathematics Scholars (ASEMS) Program, and will aim to increase the retention of these students in STEM majors. Technical AbstractThis proposal will create and study novel correlated states in graphene heterostructures using a combination of scanning probe microscopy and electrical transport measurements. In addition, this project will train graduate and undergraduate students in the field of nanoscience. While graphene is a topologically trivial semi-metal, there are a wide range of other two-dimensional materials which are expected to exhibit more exotic behavior such as superconductors and topological insulators. By creating vertical heterostructures between graphene and these other materials, unique states will be created in graphene devices. In particular, three different types of devices will be fabricated and studied: (1) graphene on hexagonal boron nitride to create a commensurate stacking and therefore open a band gap in graphene. (2) Graphene on superconductors to study the proximity effect and the effect of a periodic magnetic field from vortices. (3) Graphene on topological insulators and heavy metal transition metal dichalcogenides to enhance the spin-orbit interaction in graphene. The key to an understanding of all these induced states in graphene is the ability to map their behavior on the atomic scale that the combination of scanning probe microscopy and electrical transport measurements will provide.

纳米材料中电子自由度的控制对于新现象的出现至关重要。最近，许多原子级薄的材料已经被认识到，每一种材料都提供了独特的性质，从超导体到半导体和绝缘体。通过在垂直异质结构中结合这些原子级薄的材料，预计将出现新的电子特性。空间分辨探针为精确测量和控制这些二维材料的电子特性提供了独特的机会。这些探针能够测量材料的方向以及它们之间的相互作用。这些量最终决定了可以在异质结构中产生的状态的类型。在这项建议中获得的结果将导致新的电子器件，如晶体管，光电探测器和传感器的发展。拟议的计划将为研究生提供培训，并使来自服务不足群体的本科生能够通过亚利桑那州科学，工程和数学学者（ASEMS）计划参与研究，并旨在提高这些学生在STEM专业的保留率。技术摘要本提案将使用扫描探针显微镜和电输运测量的组合来创建和研究石墨烯异质结构中的新关联态。此外，该项目还将培训纳米科学领域的研究生和本科生。虽然石墨烯是一种拓扑上平凡的半金属，但还有许多其他二维材料有望表现出更奇特的行为，如超导体和拓扑绝缘体。通过在石墨烯和这些其他材料之间创建垂直异质结构，将在石墨烯器件中创建独特的状态。特别是，将制造和研究三种不同类型的器件：（1）六方氮化硼上的石墨烯，以创建相称的堆叠，从而在石墨烯中打开带隙。(2)石墨烯在超导体上研究邻近效应和周期性磁场对涡旋的影响。 (3)拓扑绝缘体上的石墨烯和重金属过渡金属二硫属化物以增强石墨烯中的自旋轨道相互作用。理解石墨烯中所有这些诱导态的关键是能够在原子尺度上映射它们的行为，扫描探针显微镜和电输运测量的组合将提供这种能力。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Probing the wave functions of correlated states in magic angle graphene

探讨魔角石墨烯中相关态的波函数

DOI：
10.1103/physrevresearch.2.033181
发表时间：
2020
期刊：
Physical Review Research
影响因子：
4.2
作者：
Zhang, Zhiming;Myers, Rachel;Watanabe, Kenji;Taniguchi, Takashi;LeRoy, Brian J.
通讯作者：
LeRoy, Brian J.

Flat bands in twisted bilayer transition metal dichalcogenides