论文标题
扭曲的范德华异质结构中的等离子增强近场手性
Plasmon-enhanced near-field chirality in twisted van der Waals heterostructures
论文作者
论文摘要
结果表明，手性等离子体的特征是伴随纵向电荷等离子体的纵向磁矩，导致电磁近场也是手性的。对于扭曲的双层石墨烯，我们估计筛选的等离子的近场手性可能比相关的圆极化光的数量级大几个数量级。手性也以偏转角度表现出来，在等离子体传播的方向及其poynting载体之间形成。因此，扭曲的范德华异质结构可能提供了一个新型平台，可以在手性分子中促进对映异构体选择性的物理化学过程，而无需应用磁场或外部纳米模式，该过程分别破坏了时间倒流，反射镜平面或反式对称性。
It is shown that chiral plasmons, characterized by a longitudinal magnetic moment accompanying the longitudinal charge plasmon, lead to electromagnetic near-fields that are also chiral. For twisted bilayer graphene, we estimate that the near field chirality of screened plasmons can be several orders of magnitude larger than that of the related circularly polarized light. The chirality also manifests itself in a deflection angle that is formed between the direction of the plasmon propagation and its Poynting vector. Twisted van der Waals heterostructures might thus provide a novel platform to promote enantiomer-selective physio-chemical processes in chiral molecules without the application of a magnetic field or external nano-patterning that break time-reversal, mirror plane or inversion symmetry, respectively.
