CAREER: Intrinsic Transport Properties of Graphene: Approaching the Elusive Ground State on Crystalline Substrates

职业：石墨烯的固有输运特性：接近晶体基底上难以捉摸的基态

• 批准号: 0955625
• 负责人: Masahiro Ishigami
• 金额: $ 55万
• 依托单位: The University of Central Florida Board of Trustees
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-02-15 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0955625&HistoricalAwards=false
• 关键词: CAREER; Intrinsic; Transport; Properties; Graphene

****NON-TECHNICAL ABSTRACT****Graphene, a single layer of graphite, possesses unique electronic properties important for both fundamental and applied nanoscale materials physics research. Charge carriers in graphene behave much like light. This unusual property of intrinsic disorder-free graphene can be exploited to explore the consequences of relativistic Quantum Electrodynamics on a chip, making graphene important for increasing our understanding of fundamental physics. The utility of graphene for electronic applications is demonstrated by the observed response of the charge carriers to an applied electric field (the field effect). Yet, because graphene is composed of only surface atoms, its intrinsic properties are sensitive to adsorbates and substrate-induced disorder. Adsorbate-induced disorder can now be eliminated, but so far substrate-induced disorder has not been controlled. Thus, the intrinsic properties of graphene remain unknown. This Faculty Early Career Award supports projects seeking to uncover the intrinsic properties of graphene and pave a way for the exploration of Quantum Electrodynamics by utilizing crystalline substrates. Such substrates are expected to eliminate substrate-induced disorder, and create ?perfect? graphene. The studies will also elucidate the intrinsic limitation of graphene-based devices. Thus, they have the potential to have a broad impact on electronic applications of graphene. The graduate and undergraduate students participating in, and supported by, this project will receive training in cutting-edge-interdisciplinary-nanoscience research. A course will be developed for upper-level undergraduates to bring the frontiers of nanoscience, particularly as exhibited by carbon nanostructures, to the classroom. The research program will also be integrated with development of extensive educational outreach activities for the general public. The outreach program will be tailored for students in grades 6-12, K-12 educators, and the local community with emphasis on underrepresented minorities from a diverse population represented in the Central Florida region. The outreach efforts will be designed to recruit, educate and train the next generation scientists and to increase the overall scientific literacy of the community.****TECHNICAL ABSTRACT****Graphene, a single layer of graphite, is a perfect two-dimensional semi-metallic electronic material, which possesses a linear dispersion and electron-hole symmetry with a vanishing density of electronic states at the Fermi level. This unusual band structure, akin to the light dispersion in free space, has inspired many theoretical proposals for testing the consequences of relativistic Quantum Electrodynamics using graphene. Yet, the extreme sensitivity of graphene to adsorbates and substrates has made made it impossible to perform experiments on intrinsic disorder-free graphene. While adsorbate-induced disorder can now be eliminated, substrate-induced disorder remains an issue. This Faculty Early Career Award supports projects that will pave the way for series of groundbreaking experiments, by enabling investigations of flat, atomically-clean graphene with minimal disorder using crystalline substrates. Intrinsic transport properties will be elucidated. The ability to access disorder-free graphene will be utilized as a broad foundation for exploring consequences of Quantum Electrodynamics with a high fine structure constant. The graduate and undergraduate students participating in this research will receive hands-on training in cutting-edge nanoscience techniques. A course will be developed for upper-level undergraduates to bring the frontiers of nanoscience to the classroom. The research program will be integrated with the development of extensive educational outreach activities for the general public. The outreach efforts will be designed to recruit, educate and train the next generation of scientists and to increase the overall scientific literacy of the community.

* 非技术摘要 * 石墨烯是一种单层石墨，具有独特的电子特性，对于基础和应用纳米材料物理研究都很重要。石墨烯中的电荷载流子的行为很像光。这种不寻常的性质的内在无序无石墨烯可以用来探索芯片上的相对论量子电动力学的后果，使石墨烯重要的是增加我们对基础物理的理解。石墨烯在电子应用中的效用通过观察到的电荷载流子对施加的电场的响应（场效应）来证明。然而，由于石墨烯仅由表面原子组成，因此其固有性质对吸附物和衬底诱导的无序很敏感。吸附诱导的无序现在可以消除，但到目前为止，基板诱导的无序尚未得到控制。因此，石墨烯的固有性质仍然未知。 该学院早期职业奖支持寻求揭示石墨烯内在特性的项目，并通过利用晶体衬底为量子电动力学的探索铺平道路。预计此类底物将消除底物诱导的无序，并产生？完美吗石墨烯。 这些研究还将阐明石墨烯基器件的内在局限性。因此，它们有可能对石墨烯的电子应用产生广泛的影响。 研究生和本科生参与，并支持，这个项目将接受培训，在尖端的跨学科纳米科学研究。 将为高年级本科生开发一门课程，将纳米科学的前沿知识，特别是碳纳米结构所展示的知识带到课堂上。 该研究计划还将与为公众开展广泛的教育推广活动相结合。外展计划将为6-12年级的学生，K-12教育工作者和当地社区量身定制，重点是来自佛罗里达中部地区代表的多样化人口中代表性不足的少数民族。推广工作的目的是招募、教育和培训下一代科学家，并提高社区的总体科学素养。石墨烯是一种理想的二维半金属电子材料，具有线性色散和电子-空穴对称性，在费米能级上电子态密度为零。这种不寻常的能带结构，类似于自由空间中的光色散，激发了许多使用石墨烯测试相对论量子电动力学后果的理论建议。然而，石墨烯对吸附物和基底的极端敏感性使得不可能对本征无无序石墨烯进行实验。 虽然现在可以消除吸附物诱导的无序，但基质诱导的无序仍然是一个问题。该教师早期职业奖支持的项目将为一系列开创性实验铺平道路，通过使用晶体基底研究扁平、原子清洁、无序度最低的石墨烯。将阐明固有的输运性质。获得无无序石墨烯的能力将被用作探索具有高精细结构常数的量子电动力学后果的广泛基础。参与这项研究的研究生和本科生将接受尖端纳米科学技术的实践培训。将为高年级本科生开发一门课程，将纳米科学的前沿带到课堂上。该研究计划将与为公众开展的广泛的教育推广活动相结合。外联工作的目的是招募、教育和培训下一代科学家，并提高社区的总体科学素养。