Spectroscopic Properties of Two-Dimensional Superconductors

二维超导体的光谱特性

• 批准号: 2004691
• 负责人: Abhay Pasupathy
• 金额: $ 60万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-12-15 至 2024-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2004691&HistoricalAwards=false
• 关键词: Spectroscopic; Properties; Two; Dimensional; Superconductors

Non-technical Abstract: Superconductors are special states of solid matter. Understanding what makes solids superconducting is a grand goal of physics research, useful in the emerging fields of quantum communication and computation. Recently, a number of new superconductors have been discovered in layered van der Waals materials that are crystalline in nature. But the mechanisms of superconductivity and the consequences of the superconducting state to the observed properties are still unknown. In this project, scanning tunneling microscopy will be used to understand the quantum mechanical properties of these new classes of materials at the atomic scale. Research performed in this project will be used to develop new modules for high school and undergraduate education. The project will also provide science and technical education opportunities for students at levels from high school upwards.Technical Abstract: Superconductivity in two dimensions remains an intellectual frontier in condensed matter physics with fundamental open problems in understanding pairing mechanisms and fluctuations and their consequences for the observed spectroscopic and transport properties. Recently, it has become possible to create crystalline two-dimensional superconductors that are only a few unit cells thick. These include mechanically exfoliated bulk superconductors such as niobium diselenide as well as new emergent superconductors such as twisted bilayer graphene. This project will use scanning tunneling microscopy and spectroscopy to gain insight into the local density of states in these new classes of superconductors. Interference experiments will be used to gain insight into the symmetry and structure of superconducting gaps. Measurements in applied magnetic fields will also be used to gain insight into vortex motion and fluctuations in these materials which can often be in the clean limit where the mean free path is much larger than the size of vortices.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.

非技术摘要：超导体是固体物质的特殊状态。了解什么使固体超导是物理研究的宏伟目标，在量子通信和计算的新兴领域很有用。最近，在本质上是晶体的分层范德华材料中发现了许多新的超导体。但是，超导性的机制以及超导状态对观察到的特性的后果仍然未知。在该项目中，扫描隧道显微镜将用于理解原子尺度上这些新型材料的量子机械性能。该项目进行的研究将用于开发高中和本科教育的新模块。该项目还将为高中级别的学生提供科学和技术教育的机会。技术摘要：二维的超导性仍然是凝聚态物理学的智力领域，在理解配对机制和波动方面，对观察到的光谱和运输特性的后果进行了基本开放问题。最近，已经有可能创建仅几个单位细胞厚的晶体二维超导体。这些包括机械剥落的大块超导体，例如二苯胺以及新的新兴超导体，例如扭曲的双层石墨烯。该项目将使用扫描隧道显微镜和光谱法，以深入了解这些新类别超导体中状态的局部密度。干扰实验将用于洞悉超导间隙的对称性和结构。应用磁场中的测量值也将用于洞悉这些材料的涡旋运动和波动，这些材料通常可以在平均自由路径大得多的情况下占据干净的极限，而自由路径大得多。该奖项反映了NSF的法定任务，并通过评估该基金会的知识点功能和广泛的影响来评估NSF的法定任务。

项目成果

Orderly disorder in magic-angle twisted trilayer graphene

• DOI: 10.1126/science.abk1895
• 发表时间: 2021-09
• 期刊: Science
• 影响因子: 56.9
• 作者: Simon Turkel;Joshua Swann;Ziyan Zhu;Maine Christos;K. Watanabe;T. Taniguchi;S. Sachdev;M. Scheurer;E. Kaxiras;C. Dean;A. Pasupathy