Plasmon-enhanced near-field chirality in twisted van der Waals heterostructures

T. Stauber, T. Low, G. Gómez-Santos

Published 2020-08-31Version 1

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 this chirality can be several orders of magnitude larger than that of the related circular 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.