具有扭曲原子双层膜的手征等离子体激元
Chiral plasmons with twisted atomic bilayers
摘要：
具有旋转错位的原子薄层的范德华异质结构，例如扭曲的双层石墨烯，具有有趣的结构莫尔超晶格。由于扭曲原子层之间的量子耦合，光-物质相互作用本质上是手性的;因此，它们为极端纳米尺度的手性等离子体提供了一个有前途的平台。然而，虽然层间量子耦合可能是显着的，其影响手性等离子体仍然难以捉摸。本文从全麦克斯韦方程组出发，考虑层间量子耦合，给出了扭曲双层原子中手征等离子体激元的一般解。我们发现扭曲原子双层膜与手征超颖表面有着直接的对应关系，手征超颖表面除了具有一般的表面导电性外，还同时具有手征和磁性表面导电性。换句话说，扭曲范德华异质结构中的层间量子耦合可以促进各种（例如，双各向异性）原子级薄超颖表面。此外，由层间量子耦合确定的手性表面电导率决定了手性等离子体的存在并导致独特的相位关系（即，+/-π/2相位差）。重要的是，这种独特的相位关系的手征等离子体激元可以用来构建丢失的纵向自旋的等离子体激元，除了共同的横向自旋的等离子体激元。
英文摘要：
Van der Waals heterostructures of atomically thin layers with rotational misalignments, such as twisted bilayer graphene, feature interesting structural moiré superlattices. Due to the quantum coupling between the twisted atomic layers, light-matter interaction is inherently chiral; as such, they provide a promising platform for chiral plasmons in the extreme nanoscale. However, while the interlayer quantum coupling can be significant, its influence on chiral plasmons still remains elusive. Here we present the general solutions from full Maxwell equations of chiral plasmons in twisted atomic bilayers, with the consideration of interlayer quantum coupling. We find twisted atomic bilayers have a direct correspondence to the chiral metasurface, which simultaneously possesses chiral and magnetic surface conductivities, besides the common electric surface conductivity. In other words, the interlayer quantum coupling in twisted van der Waals heterostructures may facilitate the construction of various (e.g., bi-anisotropic) atomically-thin metasurfaces. Moreover, the chiral surface conductivity, determined by the interlayer quantum coupling, determines the existence of chiral plasmons and leads to a unique phase relationship (i.e., +/-π/2 phase difference) between their TE and TM wave components. Importantly, such a unique phase relationship for chiral plasmons can be exploited to construct the missing longitudinal spin of plasmons, besides the common transverse spin of plasmons.
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