Identification of spin, valley and moiré quasi-angular momentum of interlayer excitons

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

doi:10.1038/s41567-019-0631-4

Identification of spin, valley and moiré quasi-angular momentum of interlayer excitons

Journal Article · Mon Aug 26 00:00:00 EDT 2019 · Nature Physics

DOI:https://doi.org/10.1038/s41567-019-0631-4· OSTI ID:1604679

Jin, Chenhao ^[1]; Regan, Emma C ^[1]; Wang, Danqing ^[1]; Utama, M Iqbal Bakti ^[1]; Yang, Chan-Shan ^[2]; Cain, Jeffrey ^[3]; Qin, Ying ^[4]; Shen, Yuxia ^[4]; Zheng, Zhiren ^[1]; Watanabe, Kenji ^[5]; Taniguchi, Takashi ^[5]; Tongay, Sefaattin ^[4]; Zettl, Alex ^[3]; Wang, Feng ^[3]

Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); National Taiwan Normal Univ., Taipei (Taiwan)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Kavli Energy NanoScience Institute, Berkeley, CA (United States)
Arizona State Univ., Tempe, AZ (United States)
National Inst. for Materials Science, Tsukuba (Japan)

Moiré 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 moiré superlattice potential not only localizes interlayer exciton states at different superlattice positions, but also hosts an emerging moiré quasi-angular momentum (QAM) that periodically switches the optical selection rules for interlayer excitons at different moiré sites. Here we report the observation of multiple interlayer exciton states coexisting in a WSe₂/WS₂ moiré superlattice and unambiguously determine their spin, valley, and moiré QAM through novel resonant optical pump-probe spectroscopy and photoluminescence excitation spectroscopy. We demonstrate that interlayer excitons localized at different moiré sites can exhibit opposite optical selection rules due to the spatially-varying moiré QAM. Finally, our observation reveals new opportunities to engineer interlayer exciton states and valley physics with moiré superlattices for optoelectronic and valleytronic applications.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan; National Science Foundation (NSF); US Army Research Office (ARO); USDOD; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1604679

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 11 Vol. 15; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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