4.8 Article

Hybridized intervalley moire excitons and flat bands in twisted WSe2bilayers

Journal

NANOSCALE
Volume 12, Issue 20, Pages 11088-11094

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr02160a

Keywords

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Funding

  1. European Unions Horizon 2020 research and innovation program [785219]
  2. Swedish Research Council (VR) [2018-00734]
  3. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [314695032 - SFB 1277]
  4. Swedish Research Council [2018-00734] Funding Source: Swedish Research Council

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The large surface-to-volume ratio in atomically thin 2D materials allows to efficiently tune their properties through modifications of their environment. Artificial stacking of two monolayers into a bilayer leads to an overlap of layer-localized wave functions giving rise to a twist angle-dependent hybridization of excitonic states. In this joint theory-experiment study, we demonstrate the impact of interlayer hybridization on bright and momentum-dark excitons in twisted WSe(2)bilayers. In particular, we show that the strong hybridization of electrons at the ? point leads to a drastic redshift of the momentum-dark K-? exciton, accompanied by the emergence of flat moire exciton bands at small twist angles. We directly compare theoretically predicted and experimentally measured optical spectra allowing us to identify photoluminescence signals stemming from phonon-assisted recombination of layer-hybridized dark excitons. Moreover, we predict the emergence of additional spectral features resulting from the moire potential of the twisted bilayer lattice.

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