arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2010.03067cond-mat.mtrl-sci
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利用太赫兹区狄拉克等离子体激元的非定域性探测范德华异质结构的结构和组成

Probing the structure and composition of van der Waals heterostructures using the nonlocality of Dirac plasmons in the terahertz regime

I. R. Lavor, L. S. R. Cavalcante, Andrey Chaves, F. M. Peeters, B. Van Duppen

摘要:

石墨烯中的狄拉克等离子体对环境的介电性质非常敏感。我们表明,这可以用来探测放置在单个石墨烯层下面的范德华异质结构(vdWh)的结构和组成。为了做到这一点,我们评估由六方氮化硼和不同类型的过渡金属二硫属化物(TMD)组成的vdWh。通过进行现实的模拟,占每层的vdWh的贡献分别和包括基板声子的重要性,我们表明,可以实现单层分辨率通过调查的狄拉克等离子体激元极化激元的非局部性质。一旦vdWh叠层由多于两个TMD层组成,就可以从等离子体-声子耦合推断vdWh叠层的组成。此外,我们表明,在太赫兹制度的等离子体屏蔽性能的TMD堆栈的散装字符达到只有超过100层。

英文摘要:

Dirac plasmons in graphene are very sensitive to the dielectric properties of the environment. We show that this can be used to probe the structure and composition of van der Waals heterostructures (vdWh) put underneath a single graphene layer. In order to do so, we assess vdWh composed of hexagonal boron nitride and different types of transition metal dichalcogenides (TMDs). By performing realistic simulations that account for the contribution of each layer of the vdWh separately and including the importance of the substrate phonons, we show that one can achieve single-layer resolution by investigating the nonlocal nature of the Dirac plasmon-polaritons. The composition of the vdWh stack can be inferred from the plasmon-phonon coupling once it is composed by more than two TMD layers. Furthermore, we show that the bulk character of TMD stacks for plasmonic screening properties in the terahertz regime is reached only beyond 100 layers.

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