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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.2: Poster

Wednesday, March 29, 2023, 17:00–19:00, P1

A Model Study of the Phonon-Impact on Absorption Spectra of Moiré Exciton-Polaritons — •Kevin Jürgens¹, Daniel Wigger², and Tilmann Kuhn¹ — ¹Institute of Solid State Theory, University of Münster, Germany — ²School of Physics, Trinity College Dublin, Ireland

The interaction of multiple quantum emitters coupled to a resonant optical field can produce interesting collective behavior. Twisted bilayers of transition metal dichalcogenides are a class of materials, where localized quantum emitters, in this case moiré excitons, can occur. According to their strong localization at the minima of the moiré potential, these excitons have a relatively flat band structure. If the heterostructure is placed into an optical cavity, all excitons interact with the same mode of the resonator, leading to the formation of exciton-polaritons which can interact with lattice vibrations.

We model the moiré excitons in the limit of small densities as bosonic particles that couple to a single quantized cavity mode, resulting in lower and uper polariton states. In addition, each exciton is coupled to the same acoustic phonon bath. The interaction with phonons leads to inter- and intraband transitions between the two polariton branches that strongly depend on the curvature of the polariton dispersion.

We calculate absorption spectra and discuss the influence of phonons on the spectral shape and peak positions, and systematically study the influence of the band structures curvature.