Resolving spin, valley, and moiré quasi-angular momentum of interlayer excitons in WSe2/WS2 heterostructures
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Resolving spin, valley, and moiré quasi-angular momentum of interlayer excitons in WSe2/WS2 heterostructures

  • Author(s): Jin, Chenhao;
  • Regan, Emma C;
  • Wang, Danqing;
  • Utama, M Iqbal Bakti;
  • Yang, Chan-Shan;
  • Cain, Jeffrey;
  • Qin, Ying;
  • Shen, Yuxia;
  • Zheng, Zhiren;
  • Watanabe, Kenji;
  • Taniguchi, Takashi;
  • Tongay, Sefaattin;
  • Zettl, Alex;
  • Wang, Feng
  • et al.
Abstract

Moir e superlattices provide a powerful way to engineer properties of electrons and excitons in two-dimensional van der Waals heterostructures. The moir e effect can be especially strong for interlayer excitons, where electrons and holes reside in different layers and can be addressed separately. In particular, it was recently proposed that the moir e superlattice potential not only localizes interlayer exciton states at different superlattice positions, but also hosts an emerging moir e quasi-angular momentum (QAM) that periodically switches the optical selection rules for interlayer excitons at different moir e sites. Here we report the observation of multiple interlayer exciton states coexisting in a WSe2/WS2 moir e superlattice and unambiguously determine their spin, valley, and moir e QAM through novel resonant optical pump-probe spectroscopy and photoluminescence excitation spectroscopy. We demonstrate that interlayer excitons localized at different moir e sites can exhibit opposite optical selection rules due to the spatially-varying moir e QAM. Our observation reveals new opportunities to engineer interlayer exciton states and valley physics with moir e superlattices for optoelectronic and valleytronic applications.

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