Interlayer exciton polaritons in homobilayers of transition metal dichalcogenides
Artikel i vetenskaplig tidskrift, 2023

Transition metal dichalcogenides integrated within a high-quality microcavity support well-defined exciton polaritons. While the role of intralayer excitons in 2D polaritonics is well studied, interlayer excitons have been largely ignored due to their weak oscillator strength. Using a microscopic and material-realistic Wannier-Hopfield model, we demonstrate that MoS2 homobilayers in a Fabry-Perot cavity support polaritons that exhibit a large interlayer exciton contribution, while remaining visible in linear optical spectra. Interestingly, with suitable tuning of the cavity length, the hybridization between intra- and interlayer excitons can be ‘unmixed’ due to the interaction with photons. We predict formation of polaritons where > 90 % of the total excitonic contribution is stemming from the interlayer exciton. Furthermore, we explore the conditions on the tunneling strength and exciton energy landscape to push this to 100%. Despite the extremely weak oscillator strength of the underlying interlayer exciton, optical energy can be effectively fed into the polaritons once the critical coupling condition of balanced radiative and scattering decay channels is met. These findings have a wide relevance for fields ranging from nonlinear optoelectronic devices to Bose-Einstein condensation.

excitons

van der Waals heterostructures

polaritons

transition-metal dichalcogenides

Författare

Jonas K. König

Philipps-Universität Marburg

Jamie Fitzgerald

Chalmers, Fysik, Kondenserad materie- och materialteori

Philipps-Universität Marburg

Joakim Hagel

Chalmers, Fysik, Kondenserad materie- och materialteori

Daniel Erkensten

Chalmers, Fysik, Kondenserad materie- och materialteori

Ermin Malic

Chalmers, Fysik, Kondenserad materie- och materialteori

Philipps-Universität Marburg

2D Materials

2053-1583 (eISSN)

Vol. 10 2 025019

Graphene Core Project 3 (Graphene Flagship)

Europeiska kommissionen (EU) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1088/2053-1583/acc1f5

Mer information

Senast uppdaterat

2023-04-13