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HIGHLIGHTSObservation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices

March 15, 2019

Scientific Achievement

Observation of distinct moiré superlattice exciton states in WSe₂/WS₂ heterostructures using optical spectroscopy.

Significance and Impact

Moiré exciton bands provide an promising platform to realize novel excited states of matter.

Research Details

• Observed multiple emergent peaks around the original WSe₂ exciton resonance with distinct doping dependences in aligned WSe₂/WS₂ heterostructures.
• The experimental phenomena can be explained using a model where the moiré potential is much stronger than the exciton kinetic energy and creates flat exciton bands.

C. Jin, E. C. Regan, A. Yan, M. I. B. Utama, D. Wang, S. Zhao, Y. Qin, S. Yang, Z. Zheng, S. Shi, K. Watanabe, T. Taniguchi, S. Tongay, A. Zettl, F. Wang. Nature (2019). doi:10.1038/s41586-019-0976-y.