GOALI: Creating Novel Graphene-Based Metematerials through Nanopatterning

技术描述：这个GOALI项目旨在在石墨烯中创建一个强大且可重复的带隙。为了实现这一目标，人们研究了各种几何形状的超晶格，定制了超材料的能带结构、有效质量、载流子群速度和其他电子特性。该项目涉及学术界（普渡大学）和工业界（IBM T.J.沃森研究中心）之间的合作。实验方法之一是使用纳米图案化掩模来创建具有积极缩放的晶格尺寸和真实周期性的石墨烯超晶格。另一种方法涉及利用具有超晶格周期性的外部电势压印到石墨烯上。通过比较周期性图案化石墨烯超材料和栅控石墨烯的电子性质，深入研究了边缘态对超材料能带结构的影响。该研究项目的成功可以为通过纳米尺度图案化在二维材料中制造超晶格提供通用解决方案。非技术描述：该研究项目解决了石墨烯领域最紧迫的挑战之一：如何创建一个强大的和可再生的带隙，使石墨烯在模拟和数字电子领域的实际应用成为可能。通过普渡大学和IBM之间的联合研究，研究了新的图案化方法，以实现带隙创建所需的周期性和可再现的功能。此外，该项目还为材料科学、纳米图案和器件工程方面的研究生和本科生提供了培训机会。PI还致力于参与并为普渡大学的教育推广计划做出贡献。

Technical Description: This GOALI project aims to create a robust and reproducible bandgap in graphene. To achieve this goal, superlattices of various geometries are studied, tailoring the band structure, the effective mass, carrier group velocity and other electronic properties of the metamaterials. The project involves collaboration between academia (Purdue University) and industry (IBM T.J. Watson Research Center). One of the experimental approaches is to use a nano-patterning mask to create graphene superlattices with aggressively scaled lattice dimensions and true periodicities. Another approach involves utilizing an external potential with a superlattice periodicity imprinted onto graphene. A comparison of the electronic properties of periodically patterned graphene metamaterials and gated graphene enables an in-depth study of the impact of edge states on the band structures of the metamaterials. The success of this research project can provide a general solution to fabricating superlattices in two-dimensional materials by nano-scale patterning.Non-technical Description: This research project addresses one of the most pressing challenges in the graphene field: how to create a robust and reproducible bandgap to enable practical uses of graphene in analog and digital electronics. Through a joint study between Purdue University and IBM, novel patterning methods are investigated in order to achieve the periodic and reproducible features required for bandgap creation. In addition, this project provides opportunities for the training of graduate and undergraduate students in materials science, nano-patterning, and device engineering. The PI is also committed to participate in and contribute to educational outreach programs at Purdue University.