GOALI: Creating Novel Graphene-Based Metematerials through Nanopatterning

技术描述：这个GALI项目的目标是在石墨烯中创造一个坚固且可重现的带隙。为了实现这一目标，人们研究了不同几何形状的超晶格，调整了超材料的能带结构、有效质量、载流子群速度和其他电子性质。该项目涉及学术界(普渡大学)和产业界(IBM T.J.沃森研究中心)之间的合作。其中一种实验方法是使用纳米图案掩模来创建具有大规模晶格尺寸和真正周期性的石墨烯超晶格。另一种方法包括利用石墨烯上印有超晶格周期性的外部电势。通过对周期性图案化石墨烯超材料和门控石墨烯的电子性质的比较，可以深入研究边缘状态对超材料能带结构的影响。这一研究项目的成功可以为通过纳米级图案在二维材料中制造超晶格提供一般解决方案。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：如何创建坚固且可重复的带隙，使石墨烯能够在模拟和数字电子中得到实际应用。通过普渡大学和IBM的一项联合研究，研究了新的图案化方法，以实现创建带隙所需的周期性和可重复性特征。此外，该项目还为材料科学、纳米图形和设备工程方面的研究生和本科生提供了培训机会。国际和平协会还致力于参与普渡大学的教育推广计划，并为其做出贡献。

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.