固定边界石墨烯电场驱动下的面外共振  

Out-of-plane resonance of fixed boundary graphene driven by an electric field

作　　者：张成铸 卫天宇 王英杰 李建高 唐锦锟 张东波 ZHANG Chengzhu;WEI Tianyu;WANG Yingjie;LI Jiangao;TANG Jinkun;ZHANG Dongbo(Department of Physics,Beijing Normal University,100875,Beijing,China;College of Nuclear Science and Technology,Beijing Normal University,100875,Beijing,China)

机构地区：[1]北京师范大学物理学系,北京100875 [2]北京师范大学核科学与技术学院,北京100875

出　　处：《北京师范大学学报（自然科学版）》2023年第6期956-961,共6页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(12274035)。

摘　　要：从连续模型出发,结合声子计算,探讨了固定边界石墨烯片在垂直外电场驱动下形成的面外共振.连续模型揭示了共振的不同模式,并预测了共振模式的频率.这些共振模式与石墨烯的声子性质密切相关.原子级的声子计算表明,面外的声子模式对应的共振模式,其频率与连续模型的预测一致.从力学角度考虑,石墨烯片所发生的机械共振产生了结构上的非均匀变形.这种外场诱导的非均匀结构畸变,为石墨烯物性的应变调控提供了一个新的可能.Graphene is important in low-dimensional condensed matter physics.Due to its two-dimensional structure with only a single atomic layer,graphene exhibits excellent structural flexibility and can sustain diverse structural deformations.This mechanical property makes strain control of graphene properties extremely convenient.Starting from a continuum model,this article explores the out-of-plane resonance with different modes of fixed boundary graphene sheets driven by a vertical external electric field.These resonance modes are closely related to the phonon properties of graphene.Atomic level phonon calculations reveal that out-of-plane polarized phonon modes capture such modes,frequencies of these phonon are consistent with prediction of the continuous model.The non-uniform deformation of graphene structure induced by external fields provides a new approach for strain engineering of graphene.

关 键 词：石墨烯 共振 本征频率 连续模型 声子 

分 类 号：O469[理学—凝聚态物理]