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
张成铸 1卫天宇 1王英杰 1李建高 2唐锦锟 2张东波1
作者信息
- 1. 北京师范大学物理学系,100875,北京
- 2. 北京师范大学核科学与技术学院,100875,北京
- 折叠
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.
Abstract
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Key words
graphene/resonance/eigen-frequency/continuum model/phonon引用本文复制引用
出版年
2023
国家科技期刊平台
NSTL
维普
万方数据