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Title: Triaxially strained suspended graphene for large-area pseudo-magnetic fields
Authors: Luo, Manlin
Sun, Hao
Qi, Zhipeng
Lu, Kunze
Chen, Melvina
Kang, Dongho
Kim, Youngmin
Burt, Daniel
Yu, Xuechao
Wang, Chongwu
Kim, Young Duck
Wang, Hong
Wang, Qi Jie
Nam, Donguk
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Source: Luo, M., Sun, H., Qi, Z., Lu, K., Chen, M., Kang, D., Kim, Y., Burt, D., Yu, X., Wang, C., Kim, Y. D., Wang, H., Wang, Q. J. & Nam, D. (2022). Triaxially strained suspended graphene for large-area pseudo-magnetic fields. Optics Letters, 47(9), 2174-2177.
Project: A2083c0053
RG 115/21
MOE2018-T2-2-011 (S)
Journal: Optics letters
Abstract: Strain-engineered graphene has garnered much attention recently owing to the possibilities of creating substantial energy gaps enabled by pseudo-magnetic fields (PMFs). While theoretical works proposed the possibility of creating large-area PMFs by straining monolayer graphene along three crystallographic directions, clear experimental demonstration of such promising devices remains elusive. Herein, we experimentally demonstrate a triaxially strained suspended graphene structure that has the potential to possess large-scale and quasi-uniform PMFs. Our structure employs uniquely designed metal electrodes that function both as stressors and metal contacts for current injection. Raman characterization and tight-binding simulations suggest the possibility of achieving PMFs over a micrometer-scale area. Current-voltage measurements confirm an efficient current injection into graphene, showing the potential of our devices for a new class of optoelectronic applications. We also theoretically propose a photonic crystal-based laser structure that obtains strongly localized optical fields overlapping with the spatial area under uniform PMFs, thus presenting a practical route toward the realization of graphene lasers.
ISSN: 0146-9592
DOI: 10.1364/OL.455569
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2022 Optica Publishing Group. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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