Plasmon-Enhanced Near-Field Chirality in Twisted van der Waals Heterostructures

Plasmon-Enhanced Near-Field Chirality in Twisted van der Waals Heterostructures

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...

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Veröffentlicht in:Nano letters 2020-12, Vol.20 (12), p.8711-8718
Hauptverfasser: Stauber, Tobias, Low, Tony, Gómez-Santos, Guillermo
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Low, Tony
Gómez-Santos, Guillermo
description 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 nanopatterning that break time-reversal, mirror plane, or inversion symmetry, respectively.
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title Plasmon-Enhanced Near-Field Chirality in Twisted van der Waals Heterostructures
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