Coupling of photonic crystal cavity and interlayer exciton in heterobilayer of transition metal dichalcogenides

Pasqual Rivera, Taylor K. Fryett, Yueyang Chen, Chang Hua Liu, Essance Ray, Fariba Hatami, Jiaqiang Yan, David Mandrus, Wang Yao, Arka Majumdar, Xiaodong Xu

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The advent of van der Waals heterostructures marks the emergence of a new class of synthetic materials with novel properties that are unattainable in their constituent materials. The 2D architecture of these layered materials makes them naturally suited for integration with a wide variety of planar nanophotonic cavities for next-generation low-power optoelectronic devices and explorations of fundamental physical effects in these new systems. Here, we report the coupling of the interlayer exciton in a transition metal dichalcogenide heterobilayer with a gallium phosphide photonic crystal defect cavity. The exciton-cavity coupling is found to be in the weak regime, resulting in ∼15-fold increase in the photoluminescence intensity for interlayer exciton in resonance with the cavity. Simulation results suggest that the increased intensity stems from a Purcell enhancement of ∼60. The order of magnitude enhancement of the photoluminescence yield offsets the low oscillator strength of the interlayer exciton, adding a new tool for probing the underlying physics of this excitonic system.

Original languageEnglish
Article number015027
Journal2D Materials
Volume7
Issue number1
DOIs
StatePublished - 2020

Keywords

  • cavity quantum electrodynamics
  • interlayer exciton
  • nanoresonator

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