论文标题
使用Terahertz制度中的Dirac等离子体的非局部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
论文作者
论文摘要
石墨烯中的狄拉克血浆对环境的介电特性非常敏感。我们表明，这可以用于探测放置在单个石墨烯层下方的范德华异质结构（VDWH）的结构和组成。为此，我们评估了由六角硼硝化硼和不同类型的过渡金属二核苷（TMDS）组成的VDWH。通过执行分别解释VDWH的每一层贡献以及包括底物声子的重要性的逼真的模拟，我们表明可以通过研究Dirac Plasmon-Polaritons的非本地性质来实现单层分辨率。一旦由两个以上的TMD层组成，就可以从等离子体phonon耦合来推断VDWH堆栈的组成。此外，我们表明，在Terahertz制度中，用于等离子筛选特性的TMD堆栈的庞大特征仅到达100层以上。
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.
