The electronic structure and dynamics of clean and adsorbate modified graphene

该奖项是根据2009年《美国复苏和再投资法案》(公法111-5)提供资金的。在这项由实验物理化学计划支持的研究项目中，Hrvoje Petek教授和金照教授将研究石墨烯的电子结构，石墨烯是碳元素的单原子厚度、片状同素异形体。这项研究将集中在石墨烯在sp2网络上的电子态，这些电子态会产生近自由电子(金属)行为。实验策略是通过化学或光激发来扰动这些态中的大多数载流子浓度，并测量电子结构和动态过程的变化，如电子-声子和屏蔽相互作用。实验工作将涉及两种干涉时间分辨电子发射技术，即双光子光电子发射(ITR-2PP)和光电子发射显微镜(ITR-PEEM)和瞬变电光反射率(TEOR)测量。使用密度泛函理论(DFT)计算石墨烯的结构也将与实验并行进行。石墨烯是一种有趣的材料，可能在未来的电子和可持续能源技术中有重要的应用。Petek和赵教授的研究将提供有关石墨烯结构和电子性质的重要信息，这些信息对于确定石墨烯在这些技术中的适用性和性能至关重要。这项研究还将为研究生的实验和理论培训提供丰富的载体。Petek和赵小组还将参加外联活动，以促进对匹兹堡地区公立学校的科学和研究的了解。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). In this research project supported by the Experimental Physical Chemistry Program, Professors Hrvoje Petek and Jin Zhao will study the electronic structure of graphene, a single atom thick, sheet-like allotrope of the element carbon. The study will focus on electronic states of graphene above the sp2 network that engender nearly free-electron (metallic) behavior. The experimental strategy is to perturb the majority carrier concentration in these states chemically or through optical excitation and measure the changes in electronic structure and dynamic processes such as electron-phonon and screening interactions. The experimental work will involve two interferometric time-resolved electron emission techniques, namely two photon photoemission (ITR-2PP) and photoelectron emission microscopy (ITR-PEEM) and transient electro-optic reflectivity (TEOR) measurements. Calculations of the graphene structure using Density Functional Theory (DFT) will also be done in parallel with the experiments.Graphene is an interesting material that may have important applications in future electronics and sustainable energy technologies. The research of Professors Petek and Zhao will provide important information on the structure and electronic properties of graphene that will be critical in establishing its applicability and performance in these technologies. The research will also provide a rich vehicle for graduate student training in both experiment and theory. The Petek and Zhao groups will also participate in outreach activities to promote an understanding of science and research in the Pittsburgh area public schools.