Broken mirror symmetry in excitonic response of reconstructed domains in twisted MoSe2/MoSe2 bilayers

  title={Broken mirror symmetry in excitonic response of reconstructed domains in twisted MoSe2/MoSe2 bilayers},
  author={Ji Ho Sung and You Zhou and Giovanni Scuri and Viktor Z{\'o}lyomi and Trond I. Andersen and Hyobin Yoo and Dominik S. Wild and Andrew Y. Joe and Ryan J. Gelly and Hoseok Heo and Samuel J. Magorrian and Damien B{\'e}rub{\'e} and Andr{\'e}s M. Mier Valdivia and Takashi Taniguchi and Kenji Watanabe and Mikhail D. Lukin and Philip Kim and Vladimir I. Fal’ko and Hong-Mi Park},
  journal={Nature Nanotechnology},
  pages={750 - 754}
Van der Waals heterostructures obtained via stacking and twisting have been used to create moiré superlattices1, enabling new optical and electronic properties in solid-state systems. Moiré lattices in twisted bilayers of transition metal dichalcogenides (TMDs) result in exciton trapping2–5, host Mott insulating and superconducting states6 and act as unique Hubbard systems7–9 whose correlated electronic states can be detected and manipulated optically. Structurally, these twisted… 

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It is demonstrated that vdWH of MoSe2/WSe2 and MoS2/WS2 at twist angles ≤ 1° undergo significant atomic level reconstruction leading to discrete commensurate domains divided by narrow domain walls, rather than a smoothly varying rigid-lattice moiré pattern as has been assumed in prior experimental work.

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