Journal
NATURE PHYSICS
Volume 15, Issue 11, Pages 1140-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41567-019-0631-4
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Funding
- US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05-CH11231, KCWF16]
- US Army Research Office under MURI [W911NF-17-1-0312]
- Elemental Strategy Initiative by the MEXT, Japan
- JSPS KAKENHI [JP15K21722]
- NSF CAREER award [NSF DMR 1552220]
- Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
- Ministry of Science and Technology [107-2112-M-003-014-MY3]
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Moire superlattices provide a powerful way to engineer the properties of electrons and excitons in two-dimensional van der Waals heterostructures(1-8). The moire 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 moire superlattice potential not only localizes interlayer exciton states at different superlattice positions, but also hosts an emerging moire quasi-angular momentum (QAM) that periodically switches the optical selection rules for interlayer excitons at different moire sites(9,10). Here, we report the observation of multiple interlayer exciton states coexisting in a WSe2/WS2 moire superlattice and unambiguously determine their spin, valley and moire QAM through novel resonant optical pump-probe spectroscopy and photoluminescence excitation spectroscopy. We demonstrate that interlayer excitons localized at different moire sites can exhibit opposite optical selection rules due to the spatially varying moire QAM. Our observation reveals new opportunities to engineer interlayer exciton states and valley physics with moire superlattices for optoelectronic and valleytronic applications.
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