NER: Two-Dimensional Nanocrystals for Nanoelectronics

该纳米级探索性研究(NER)提案是针对NSE，NSF 02-148而收到的。这个为期一年的项目将探索使用有限大小的层状过渡金属二卤化物(LTMDs)单层作为纳米电子的基本构建块的可能性。将在绝缘表面制备由单层(约0.6纳米厚)LTMDs组成的二维纳米晶，并探索将这些层与宏观电极接触的方法。这项研究将通过研究理想单片形式的准2D电子材料来扩展对它们的基本科学理解。这项研究将加强在严格的2D系统中强相互作用电子(例如超导和电荷密度波)的基础科学。电接触2D纳米晶体的发展首次将2D电子系统(2DES)带到了表面(半导体异质结构中的2DES被埋在表面下数百纳米以下)，使得使用扫描探针技术对2DES进行新的研究成为可能。亚纳米厚金属和半导体纳米晶薄膜的发展也将为纳米级电子技术开辟新的可能性。该项目将为本科生和研究生提供尖端纳米技术研究方面的优秀培训。该项目由材料研究部和物理部共同支持。这项纳米级探索性研究(NER)提案是应NSE、NSF 02-148的要求而收到的。这个为期一年的项目将探索用被称为层状过渡金属二卤化物(LTMD)的单一三原子厚度的材料层来构建电子电路的可能性。块状LTMD包括金属(如二硒化铌)和半导体(如二硫化钼)。金属相通常表现出奇异的低温行为，如超导电性和电荷密度波。这个项目提供了一个新的机会，以最基本的单页形式研究这些复杂的材料。新的实验将成为可能，例如在进行电子测量的同时，使用扫描隧道显微镜对材料中的电子态进行成像。这些超薄的金属和半导体薄膜可以应用于电子互连、晶体管、传感器等，也可以用于与纳米级电子元件的接口，如分子线。该项目将为本科生和研究生提供尖端纳米技术研究方面的优秀培训。该项目得到了材料研究和物理系的联合支持。

This Nanoscale Exploratory Research (NER) proposal was received in response to NSE, NSF 02-148. This one-year project will explore the possibility of using finite-size single layers of layered transition metal dichalcogenides (LTMDs) as a basic building block for nanoscale electronics. Two-dimensional nanocrystals consisting of single (~0.6 nanometer thick) layers of LTMDs will be prepared on insulating surfaces, and means to contact these layers with macroscopic electrodes will be explored. This research will extend the basic scientific understanding of quasi-2D electronic materials by studying them in their ideal single-sheet form. The research will enhance the basic science of strongly interacting electrons (e.g. superconductivity and charge density waves) in a strictly 2D system. The development of electrically-contacted 2D nanocrystals brings the 2D electron system (2DES) to the surface for the first time (2DESs in semiconductor heterostructures are buried hundreds of nanometers below the surface) allowing new studies of 2DESs using scanned probe techniques. The development of sub-nanometer-thick metallic and semiconducting nanocrystal films will also open new possibilities in nanometer-scale electronics technologies. This project will provide excellent training for undergraduate and graduate students in cutting-edge nanotechnology research. The project is jointly supported by the Divisions of Materials Research and Physics.This Nanoscale Exploratory Research (NER) proposal was received in response to NSE, NSF 02-148. This one-year project will explore the possibility of constructing electronic circuits from single three-atom-thick layers of materials known as layered transition metal dichalcogenides (LTMDs). In bulk form, LTMDs comprise metals (e.g. niobium diselenide) and semiconductors (e.g. molybdenum disulfide). The metallic phases often exhibit exotic low-temperature behavior, such as superconductivity and charge density waves. This program offers a new opportunity to study these complex materials in their most basic single-sheet form. New experiments will be made possible, such as the imaging of the electronic states in the material using scanning tunneling microscopy simultaneous to electronic measurements. These ultra-thin metallic and semiconducting films may find application in electronics as interconnects, transistors, sensors, etc., and may also be used to interface with nanoscale electronic elements, such as molecular wires. This project will provide excellent training for undergraduate and graduate students in cutting-edge nanotechnology research. The project is jointly supported by the Divisions of Materials Research and Physics.