\NER: Coaxial Tip Piezoresistive Cantilever Probes for High-Resolution Scanning Gate Microscopy

NER：用于高分辨率扫描门显微镜的同轴尖端压阻悬臂探针

• 批准号: 0708031
• 负责人: Beth Pruitt
• 金额: $ 13万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2009-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0708031&HistoricalAwards=false
• 关键词: NER; Coaxial; Tip; Piezoresistive; Cantilever

Objective:The goal of this research program is to design, fabricate and characterize novel probes for high-resolution scanning gate microscopy, a technique providing information on electron distribution and transport. Probes that can produce a highly-localized potential perturbation are needed to apply scanning gate microscopy to semiconductor nanostructures. The proposed probes consist of cantilevers with integrated coaxial tips to generate a confined dipolar electric field at the underlying sample. Deflection of the cantilever resulting from tip-surface interactions will be detected by modulation of a piezoresistor located at the root. Initially, the probe will be used to map the probability densities of electrons in quantum dots and other semiconductor nanostructures, which to-date is a highly-desirable but unrealized goal. Intellectual Merit:The intellectual merit includes fundamental understanding of electron organization in semiconductor nanostructures, explaining properties of these low-dimensional systems, and designing novel devices (spintronic, single-electron, etc.) exploiting these properties. Beyond scanning gate microscopy, applications include the investigation of biological specimens, failure analysis of integrated circuits, and the study of noise in semiconductor devices. The coaxial tip may also improve the resolution and contrast of scanning electrochemical microscopy and scanning near-field microscopy.Broader Impacts:The resulting knowledge will have broad social, economic, and educational impact. Improved understanding of cellular voltage-gated ion channels may lead to more effective drugs while greater insight into quantum dots may yield higher-performance replacements for transistors. Results will be disseminated through educational outreach programs. By addressing the broad problem of generating and detecting localized electromagnetic fields, the probes will influence research throughout the basic sciences and engineering.

目的：该研究计划的目的是设计，捏造和表征用于高分辨率扫描门显微镜的新型探针，该技术提供了有关电子分布和传输信息的技术。需要产生高度定位的电势扰动的探针将扫描门显微镜应用于半导体纳米结构。所提出的探针由具有集成同轴尖端的悬臂组成，以在基础样品处产生一个密闭的偶极电场。通过调制位于根部的压电器，将检测到尖端表面相互作用产生的悬臂偏转。最初，该探针将用于绘制量子点和其他半导体纳米结构中电子的概率密度，迄今为止，这是一个高度不可取但未实现的目标。智力优点：知识分子的优点包括对半导体纳米结构中电子组织的基本了解，解释了这些低维系统的特性，并设计了新型设备（Spintronic，单电子等）来利用这些属性。除了扫描门显微镜外，应用还包括研究生物标本，综合电路的失败分析以及半导体设备中噪声的研究。同轴小费还可以改善扫描电化学显微镜和扫描近场显微镜的分辨率和对比度。Broader的影响：所产生的知识将产生广泛的社会，经济和教育影响。对细胞电压门控离子通道的理解的提高可能会导致更有效的药物，而对量子点的更深入的洞察力可能会导致晶体管的更高性能替代。结果将通过教育外展计划传播。通过解决生成和检测局部电磁场的广泛问题，这些探针将影响整个基本科学和工程的研究。