EAGER: Creation and Manipulation of Quantum States in Oxide Nanostructures with a Low-Temperature Atomic-Force Microscope

EAGER：使用低温原子力显微镜在氧化物纳米结构中创建和操纵量子态

• 批准号: 0948671
• 负责人: Jeremy Levy
• 金额: $ 7.5万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0948671&HistoricalAwards=false
• 关键词: EAGER; Creation; Manipulation; Quantum; States

NON-TECHNICAL DESCRIPTIONThis research project seeks to understand the basic operating principle behind a newly discovered method for fabricating circuits whose size approaches atomic-scale dimensions. Current computer technology is based on silicon transistors which are getting close to their smallest possible size. Oxide nanoelectronics offers a new way to create transistors and other circuit elements that are required for information technology, but many basic properties are still not well understood. One way of developing such an understanding is to use a technique called atomic force microscopy, in which a small needle-like probe is scanned over a surface to measure the shape as well as alter the properties by using applied voltages to the probe. This research project will use an extension of the capabilities of such an instrument to allow the properties to be measured at much lower temperatures than was previously possible. Such control will help to uncover some of the basic mechanisms for writing and erasing nanoscale transistors and other devices. The project will provide formative experiences for the graduate student involved in the project. The low-temperature images are likely to create appealing visual representations of these nanostructures, ones that will appeal to young, impressionable students choosing their future academic trajectories.TECHNICAL DETAILSA novel method for writing and modifying conducting nanostructures at the interface between two insulators (LaAlO3 and SrTiO3) has been invented by the PI. This project will extend the operating range of a vacuum atomic force microscope (AFM) so that oxide nanostructures can be cooled to 4 K while being probed by a conducting AFM tip. At low temperatures, thermal activation of carriers from donor site is suppressed, revealing the underlying potential produced by the AFM writing process. The tip will act like a local gate, enabling the nanostructure to be probed locally and in situ, and for the potential profile to be mapping with high spatial resolution. The extended temperature range (the instrument currently operates only down to 130 K) will allow feedback on the device structure in real time so that exotic quantum states can be defined at temperatures where transport measurements are made.

非技术性解释本研究项目旨在了解一种新发现的制造尺寸接近原子尺度的电路的方法背后的基本工作原理。 目前的计算机技术是基于硅晶体管，这是接近他们的最小可能的大小。 氧化物纳米电子学为制造信息技术所需的晶体管和其他电路元件提供了一种新方法，但许多基本性质仍然没有得到很好的理解。 发展这种理解的一种方法是使用一种称为原子力显微镜的技术，在这种技术中，一个小的针状探针在表面上扫描以测量形状，并通过向探针施加电压来改变性质。 该研究项目将使用这种仪器的扩展功能，以允许在比以前可能的温度低得多的温度下测量性能。 这种控制将有助于揭示写入和擦除纳米晶体管和其他器件的一些基本机制。 该项目将为参与该项目的研究生提供形成经验。 低温图像很可能会创造出这些纳米结构的吸引人的视觉表现，这将吸引年轻的，易受影响的学生选择他们未来的学术轨迹。技术支持PI发明了一种在两种绝缘体（LaAlO3和SrTiO3）之间的界面上书写和修饰导电纳米结构的新方法。 该项目将扩展真空原子力显微镜（AFM）的工作范围，使氧化物纳米结构可以冷却到4 K，同时通过导电AFM针尖进行探测。 在低温下，从施主位点的载流子的热激活被抑制，揭示了由AFM写入过程产生的潜在的。 尖端将充当局部门，使纳米结构能够被局部和原位探测，并且用于以高空间分辨率绘制电势分布。 扩展的温度范围（该仪器目前仅在130 K以下运行）将允许在真实的时间内对器件结构进行反馈，以便在进行传输测量的温度下定义奇异量子态。