EAGER: Enabling Quantum Leap: Nanoengineering of Two-Dimensional and Twisted Ferromagnets Towards Room-Temperature Quantum Logic

非技术描述：这个急切的项目专注于开发一种新的超薄、实际上是二维的磁性材料家族，使用磁性材料原子薄膜的层层堆叠。具体地说，这项工作的重点是用超薄磁性材料制造纳米电子器件，其中有源区只有几个原子厚。目标是更好地了解这些材料和设备的磁性和电学性质。我们开发实验和理论工具来操纵和模拟这些磁性材料，并以这些系统为平台的愿景为指导，高效的信息存储和量子信息处理技术。这项研究涉及一名研究生和一名博士后助理。该项目的更广泛影响包括通过宾夕法尼亚大学实验研究物理学院和宾夕法尼亚大学暑期预科项目向高中生展示纳米科学的尖端概念，以及通过一年一度的费城科学节向普通公众展示纳米科学的活动。技术描述：本项目主要研究二维(2D)过渡金属二硫化钒和二硒化钒，它们具有平面磁矩和居里温度在室温附近的铁磁性，因此是室温量子应用的有前途的候选者。通过理论、计算和实验，研究小组正在研究这些材料的两个主要方面：(A)它们在图案化结构中从2D行为过渡到1D行为的性质，以及(B)在旋转未对准的多层堆栈中诱导的紧急现象。该项目的实验部分结合了化学气相沉积生长、机械剥离和转移以及电、光和磁测量。在任务(A)中，该项目旨在开发受控和可扩展的生长和制造技术，以创建高质量的2D材料和具有室温功能的准1D雕刻纳米结构，用于自旋电子学和其他设备应用的纳米级建筑中。同时，该团队的目标是优化结构属性，如原子边缘配置、缺陷类型和密度以及相对晶格取向，以最大限度地提高性能。在任务(B)中，该项目试图发现和利用这些材料旋转堆积产生的量子效应，并研究由空间调制的层间磁耦合引起的自旋织构。这些自旋织构可以提供丰富多样的新物理效应，并为量子信息处理提供了一个平台，可以通过自旋转移力矩来操纵。该项目的更广泛影响包括通过宾夕法尼亚大学实验研究物理学院和宾夕法尼亚大学暑期预科项目向高中生展示纳米科学的尖端概念，以及通过一年一度的费城科学节向公众展示纳米科学的前沿概念。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Nontechnical description: This EAGER project focuses on developing a new family of ultrathin, practically two dimensional magnetic materials using layer-on-layer stacking of atomically thin films of magnetic materials. Specifically, this work is focused on making nanoelectronic devices with ultrathin magnetic materials, where the active region is only a few atoms thick. The goal is to better understand the magnetic and electronic properties of these materials and devices. We develop experimental and theoretical tools to manipulate and model these magnetic materials, guided by a vision for these systems as platforms for efficient information storage and quantum information processing technologies. The research engages the participation of one graduate research student and one postdoctoral associate. The broader impacts of this project include activities to present cutting edge concepts in nanoscience to high school students through the Penn Experimental Research Physics Academy and Penn Summer Prep program, as well as to the general public through the annual Philadelphia Science Festival. Technical Description: This project focuses on the two-dimensional (2D) transition metal dichalcogenides vanadium disulfide and vanadium diselenide, shown to exhibit ferromagnetism with in-plane magnetic moments and Curie temperatures around room temperature, and are thus promising candidates for room-temperature quantum applications. Through theory, computation, and experiment, the research team is studying two main aspects of these materials: (a) their properties through the transition from 2D to 1D behavior in patterned structures, and (b) the emergent phenomena induced in rotationally misaligned multilayer stacks. The experimental component of the project combines growth by chemical vapor deposition, mechanical exfoliation and transfer, and electrical, optical, and magnetic measurements. In task (a) the project aims to develop controlled and scalable growth and fabrication techniques to create high-quality 2D materials and quasi-1D sculpted nanostructures with room temperature functionality in nanometer-scale architectures for spintronic and other device applications. Concurrently, the team aims to optimize structural properties such as atomic edge configuration, defect types and density, and relative lattice orientation to maximize performance. In task (b) the project seeks to discover and exploit the emergent quantum effects of rotational stacking of these materials and investigate the spin textures arising from the spatially modulated interlayer magnetic coupling. These spin textures may provide a rich variety of new physical effects and provide a platform for quantum information processing manipulatable by spin transfer torques. The broader impacts of this project include activities to present cutting edge concepts in nanoscience to high school students through the Penn Experimental Research Physics Academy and Penn Summer Prep program, and to the general public through the annual Philadelphia Science Festival.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.