Enhanced third-harmonic generation by manipulating the twist angle of bilayer graphene
作者机构：Department of Energy Systems ResearchAjou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Department of PhysicsUniversity of Seoul163 SiripdaeroDongdaemun-guSeoul 02504Republic of Korea Department of Smart CitiesUniversity of Seoul163 SiripdaeroDongdaemun-guSeoul 02504Republic of Korea Department of Materials Science and EngineeringAjou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Department of ChemistryAjou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Department of PhysicsAjou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2021年第10卷第2期
页 面：176-185页
核心收录：
学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术]
基 金：supported by the National Research Foundation of Korea(NRF,2019R1A2C1006119) Korea Institute of Energy Technology Evaluation and Planning(KETEP)(20184030202220)
摘 要：Twisted bilayer graphene(tBLG)has received substantial attention in various research fields due to its unconventional physical properties originating from Moire *** electronic band structure in tBLG modified by interlayer interactions enables the emergence of low-energy van Hove singularities in the density of states,allowing the observation of intriguing features such as increased optical conductivity and photocurrent at visible or near-infrared ***,we show that the third-order optical nonlinearity can be considerably modified depending on the stacking angle in *** third-harmonic generation(THG)efficiency is found to significantly increase when the energy gap at the van Hove singularity matches the three-photon resonance of incident *** study on electrically tuneable optical nonlinearity reveals that the gate-controlled THG enhancement varies with the twist angle in tBLG,resulting in a THG enhanced up to 60 times compared to neutral monolayer *** results prove that the twist angle opens up a new way to control and increase the optical *** tBLG,,suggesting rotation-induced tuneable nonlinear optics in stacked two-dimensional material systems.
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