Monolayered MoSe2: A candidate for room temperature polaritonics

N. Lundt, A. Maryński, E. Cherotchenko, A. Pant, X. Fan, Sefaattin Tongay, G. Sek, A. V. Kavokin, S. Höfling, C. Schneider

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Monolayered MoSe2 is a promising new material to investigate advanced light-matter coupling as it hosts stable and robust excitons with comparably narrow optical resonances. In this work, we investigate the evolution of the lowest lying excitonic transition, the so-called A-valley exciton, with temperature. We find a strong, phonon-induced temperature broadening of the resonance, and more importantly, a reduction of the oscillator strength for increased temperatures, which we describe in the framework of a microscopic model. Based on these experimentally extracted, temperature dependent parameters, we apply a coupled oscillator model to elucidate the possibility to observe the strong coupling regime between the A-exciton and a microcavity resonance in three prototypical photonic architectures with varying mode volumes. We find that the formation of exciton-polaritons up to ambient conditions in compact, monolithic dielectric and Tamm-based structures seems feasible. In contrast, a temperature-induced transition into the weak coupling regime can be expected for structures with extended effective cavity length. Based on these findings, we calculate and draw the phase diagram of polariton Bosonic condensation in a microcavity with embedded MoSe2 monolayers.

Original languageEnglish (US)
Article number015006
Journal2D Materials
Volume4
Issue number1
DOIs
StatePublished - Mar 1 2017

Keywords

  • 2D materials
  • Exciton-polaritons
  • Microcavity
  • MoSe
  • Strong coupling
  • Transition metal dichalcogenides

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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