Twist Angle Tuning of Moiré Exciton Polaritons in van der Waals Heterostructures
Artikel i vetenskaplig tidskrift, 2022

Twisted atomically thin semiconductors are characterized by moiré excitons. Their optical signatures and selection rules are well understood. However, their hybridization with photons in the strong coupling regime for heterostructures integrated in an optical cavity has not been the focus of research yet. Here, we combine an excitonic density matrix formalism with a Hopfield approach to provide microscopic insights into moiré exciton polaritons. In particular, we show that exciton-light coupling, polariton energy, and even the number of polariton branches can be controlled via the twist angle. We find that these new hybrid light-exciton states become delocalized relative to the constituent excitons due to the mixing with light and higher-energy excitons. The system can be interpreted as a natural quantum metamaterial with a periodicity that can be engineered via the twist angle. Our study presents a significant advance in microscopic understanding and control of moiré exciton polaritons in twisted atomically thin semiconductors.

transition metal dichalcogenides

van der Waals hetero-bilayers

moiré excitons

polaritons

Författare

Jamie Fitzgerald

Chalmers, Fysik, Kondenserad materie- och materialteori

J. J.P. Thompson

Philipps-Universität Marburg

Ermin Malic

Chalmers, Fysik, Kondenserad materie- och materialteori

Philipps-Universität Marburg

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 22 11 4468-4474

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1021/acs.nanolett.2c01175

PubMed

35594200

Mer information

Senast uppdaterat

2022-06-21