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

Tobias Stauber, Tony Low, Guillermo Gómez-Santos

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)8711-8718
Number of pages8
JournalNano letters
Volume20
Issue number12
DOIs
StatePublished - Dec 9 2020

Bibliographical note

Funding Information:
We thank José González and John Schliemann for discussions. This work has been supported by Spain’s MINECO under Grant FIS2017-82260-P, PGC2018-096955-B-C42, and CEX2018-000805-M as well as by the CSIC Research Platform on Quantum Technologies PTI-001. T.S. also acknowledges support from the “Salvador de Madariaga” Programme under Grant PRX19/00024 and from Germany’s Deutsche Forschungsgemeinschaft (DFG) via SFB 1277. T.L. acknowledges support by the National Science Foundation, NSF/EFRI Grant EFRI-1741660.

Keywords

  • chirality
  • light-matter interaction
  • plasmons
  • twisted bilayer graphene

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