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The potential for establishing energy gaps by pseudo-magnetic fields in strain-engineered graphene has sparked much interest recently. However, the limited sizes of induced pseudo-magnetic fields and the complicated platforms for straining graphene have thus far prevented researchers from harnessing the unique pseudo-magnetic fields in optoelectronic devices. In this work, we present an experimental demonstration of triaxially strained suspended graphene structures capable of obtaining quasi-uniform pseudo-magnetic fields over a large scale. The novel metal electrode design functions as both stressors and current injectors. We also propose a hybrid laser structure employing a 2D photonic crystal and triaxially strained graphene as an optical cavity and gain medium, respectively.
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Manlin Luo, Hao Sun, Zhipeng Qi, Kunze Lu, Melvina Chen, Dongho Kang, Youngmin Kim, Daniel Burt, Xuechao Yu, Chongwu Wang, Young Duck Kim, Hong Wang, Qi-Jie Wang, Donguk Nam, "Strain engineering for pseudo-magnetic fields in graphene," Proc. SPIE 12003, 2D Photonic Materials and Devices V, 1200305 (5 March 2022); https://doi.org/10.1117/12.2609933