Dispersion and decay rate of exciton-polaritons and radiative modes in transition metal dichalcogenide monolayers

Filippo Alpeggiani, Su-Hyun Gong, L. Kuipers

Research output: Contribution to journalArticle

Abstract

The two-dimensional excitons of transition metal dichalcogenide (TMDC) monolayers make these materials extremely promising for optical and optoelectronic applications. When the excitons interact with the electromagnetic field, they will give rise to exciton-polaritons, i.e., modes that propagate in the material plane while being confined in the out-of-plane direction. In this work, we derive the characteristic equations that determine both radiative and polaritonic modes in TMDC monolayers and we analyze the dispersion and decay rate of the modes. The condition for the existence of exciton-polaritons can be described in terms of a strong-coupling regime for the interaction between the exciton and the three-dimensional continuum of free-space electromagnetic modes. We show that the threshold for the strong-coupling regime critically depends on the interplay between nonradiative losses and the dielectric function imbalance at the two sides of the monolayer. Our results illustrate that a fine control of the dielectric function of the embedding media is essential for realizing exciton-polaritons in the strong-coupling regime.

Original languageEnglish
Article number205436
JournalPhysical Review B
Volume97
Issue number20
DOIs
Publication statusPublished - 2018 May 22
Externally publishedYes

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Excitons
polaritons
decay rates
Transition metals
Monolayers
transition metals
excitons
characteristic equations
Optoelectronic devices
Electromagnetic fields
embedding
LDS 751
electromagnetic fields
electromagnetism
continuums
thresholds
interactions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Dispersion and decay rate of exciton-polaritons and radiative modes in transition metal dichalcogenide monolayers. / Alpeggiani, Filippo; Gong, Su-Hyun; Kuipers, L.

In: Physical Review B, Vol. 97, No. 20, 205436, 22.05.2018.

Research output: Contribution to journalArticle

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