Controlling the Electronic Properties of Graphene

技术。该项目旨在开发控制和利用无序和衬底相互作用对石墨烯电子特性的影响所需的理解和材料技术。将研究石墨烯与衬底的相互作用，以实现电子带结构的调谐，包括打开带隙。高迁移率石墨烯的研究将有助于先进设备的发展，并允许研究与狄拉克费米子相关的现象，这些现象在粒子物理学中是无法实现的，包括克莱因隧道、齐特比空和施温格机制。新的低温量子相可以在高质量石墨烯中观察到，例如分数量子霍尔效应。吸附物与石墨烯的相互作用将被用于研究高掺杂石墨烯中的超导性和具有过渡金属杂质的石墨烯中的近藤效应等电子现象，以及研究吸附层中的有序和相变。这项研究有望产生高迁移率的石墨烯，直接适用于在比目前可能的更高频率下工作的高速模拟电子设备，从而实现通信和传感领域的高性能应用。通过衬底相互作用在石墨烯中产生带隙也可以实现石墨烯晶体管的高速、低功耗逻辑应用。此外，了解石墨烯与环境之间的相互作用可能会导致基于高迁移率石墨烯的新型化学和生化传感器。非技术。本项目主要研究电子/光子材料科学和凝聚态物理相关领域的基础研究问题。获得的基本理解有望改善器件性能，并允许设计新元件。该项目将研究与教育相结合，为学生提供实践实验室经验和培训，同时进行前沿研究。两名博士生将在纳米电子学和表面科学领域进行最先进的跨学科研究。研究人员将与研究生一起设计和实施涉及石墨烯和石墨的纳米技术演示，并将其用于向来自代表性不足群体的K-12学生和教师推广。

Technical. This project aims to develop understanding and materials techniques needed to control and exploit the effects of disorder and substrate interactions on the electronic properties of graphene. Graphene-substrate interactions will be studied to enable tuning of the electronic bandstructure, including opening a bandgap. High-mobility graphene enabled by this research will contribute to advanced device development, and allow the study of phenomena associated with Dirac fermions not accessible in particle physics, including Klein tunneling, Zitterbewegung, and the Schwinger mechanism. New low-temperature quantum phases may be observable in high-quality graphene, such as the fractional quantum Hall effect. Adsorbate interactions with graphene will be used to study electronic phenomena such as superconductivity in highly doped graphene and the Kondo effect in graphene with transition-metal impurities, as well as the study of ordering and phase transitions in the adsorbate layer. This research is expected to yield high-mobility graphene directly applicable to high-speed analog electronic devices operating at higher frequencies than presently possible, enabling high performance applications in communications and sensing. Producing a bandgap in graphene through substrate interaction may also enable high-speed, low-power logic applications of graphene transistors. Additionally, understanding interactions between graphene and the environment may lead to new types of chemical and biochemical sensors based on high-mobility graphene. Non-Technical. The project addresses fundamental research issues in a topical area of electronic/photonic materials science and condensed matter physics having technological relevance. Basic understanding gained is expected to lead to improved device performance, and to allow design of new components. The project integrates research and education providing students with hands-on laboratory experience and training while conducting forefront research. Two Ph.D. students will be trained in state-of-the-art interdisciplinary research in nanoelectronics and surface science. The investigators will work with the graduate students to design and implement nanotechnology demonstrations involving graphene and graphite, and used in outreach to K-12 students and teachers from under-represented groups.