Observation of interlayer excitons in MoSe2 single crystals

Jason Horng, Tineke Stroucken, Long Zhang, Eunice Y. Paik, Hui Deng, Stephan W. Koch

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Interlayer excitons with direct optical transitions are observed coexisting with intralayer excitons in the same K valleys in bilayer, few-layer, and bulk MoSe2 single crystals by confocal reflection contrast spectroscopy. Quantitative analysis using the Dirac-Bloch equations provides unambiguous state assignment of all the measured resonances. The interlayer excitons in bilayer MoSe2 have a large binding energy of 153 meV and a narrow linewidth of 20 meV. Their spectral weight is comparable to the commonly studied higher-order intralayer excitons. At the same time, the interlayer excitons are characterized by distinct transition energies and permanent dipole moments, providing a promising high temperature and optically accessible platform for dipolar exciton physics.

Original languageEnglish (US)
Article number241404
JournalPhysical Review B
Volume97
Issue number24
DOIs
StatePublished - Jun 7 2018

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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