Moiré trions in MoSe2/WSe2 heterobilayers

Wang, Xi; Zhu, Jiayi; Seyler, Kyle L.; Rivera, Pasqual; Zheng, Huiyuan; Wang, Yingqi; He, Minhao; Taniguchi, Takashi; Watanabe, Kenji; Yan, Jiaqiang; Mandrus, David G.; Gamelin, Daniel R.; Yao, Wang; Xu, Xiaodong

doi:10.1038/s41565-021-00969-2

Title: Moiré trions in MoSe₂/WSe₂ heterobilayers

Abstract

Transition metal dichalcogenide moiré bilayers with spatially periodic potentials have emerged as a highly tunable platform for studying both electronic and excitonic phenomena. The power of these systems lies in the combination of strong Coulomb interactions with the capability of controlling the charge number in a moiré potential trap. Electronically, exotic charge orders at both integer and fractional fillings have been discovered. However, the impact of charging effects on excitons trapped in moiré potentials is poorly understood. Here, we report the observation of moiré trions and their doping-dependent photoluminescence polarization in H-stacked MoSe₂/WSe₂ heterobilayers. We find that as moiré traps are filled with either electrons or holes, new sets of interlayer exciton photoluminescence peaks with narrow linewidths emerge about 7 meV below the energy of the neutral moiré excitons. Circularly polarized photoluminescence reveals switching from co-circular to cross-circular polarizations as moiré excitons go from being negatively charged and neutral to positively charged. Furthermore, this switching results from the competition between valley-flip and spin-flip energy relaxation pathways of photo-excited electrons during interlayer trion formation. Our results offer a starting point for engineering both bosonic and fermionic many-body effects based on moiré excitons.

Authors:

^[1]; Zhu, Jiayi ^[1]; Seyler, Kyle L. ^[1]; Rivera, Pasqual ^[1];

^[2]; Wang, Yingqi ^[1];

^[1];

^[3];

^[4]; Mandrus, David G. ^[4];

^[1];

^[2];

^[1]

Univ. of Washington, Seattle, WA (United States)
Univ. of Hong Kong (China); HKU-UCAS Joint Inst. of Theoretical and Computational Physics at Hong Kong (China)
National Inst. for Materials Science, Tsukuba (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Publication Date:: Thu Sep 16 00:00:00 EDT 2021

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1840150

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Nature Nanotechnology

Additional Journal Information:: Journal Volume: 16; Journal Issue: 11; Journal ID: ISSN 1748-3387

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Two-dimensional materials

Citation Formats


                    Wang, Xi, Zhu, Jiayi, Seyler, Kyle L., Rivera, Pasqual, Zheng, Huiyuan, Wang, Yingqi, He, Minhao, Taniguchi, Takashi, Watanabe, Kenji, Yan, Jiaqiang, Mandrus, David G., Gamelin, Daniel R., Yao, Wang, and Xu, Xiaodong. Moiré trions in MoSe2/WSe2 heterobilayers.  United States: N. p., 2021. 
Web.  doi:10.1038/s41565-021-00969-2.

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                    Wang, Xi, Zhu, Jiayi, Seyler, Kyle L., Rivera, Pasqual, Zheng, Huiyuan, Wang, Yingqi, He, Minhao, Taniguchi, Takashi, Watanabe, Kenji, Yan, Jiaqiang, Mandrus, David G., Gamelin, Daniel R., Yao, Wang, & Xu, Xiaodong. Moiré trions in MoSe2/WSe2 heterobilayers.  United States.  https://doi.org/10.1038/s41565-021-00969-2

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                    Wang, Xi, Zhu, Jiayi, Seyler, Kyle L., Rivera, Pasqual, Zheng, Huiyuan, Wang, Yingqi, He, Minhao, Taniguchi, Takashi, Watanabe, Kenji, Yan, Jiaqiang, Mandrus, David G., Gamelin, Daniel R., Yao, Wang, and Xu, Xiaodong. Thu .  
"Moiré trions in MoSe2/WSe2 heterobilayers".  United States.  https://doi.org/10.1038/s41565-021-00969-2.  https://www.osti.gov/servlets/purl/1840150.

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@article{osti_1840150,

  title        = {Moiré trions in MoSe2/WSe2 heterobilayers},

  author       = {Wang, Xi and Zhu, Jiayi and Seyler, Kyle L. and Rivera, Pasqual and Zheng, Huiyuan and Wang, Yingqi and He, Minhao and Taniguchi, Takashi and Watanabe, Kenji and Yan, Jiaqiang and Mandrus, David G. and Gamelin, Daniel R. and Yao, Wang and Xu, Xiaodong},

  abstractNote = {Transition metal dichalcogenide moiré bilayers with spatially periodic potentials have emerged as a highly tunable platform for studying both electronic and excitonic phenomena. The power of these systems lies in the combination of strong Coulomb interactions with the capability of controlling the charge number in a moiré potential trap. Electronically, exotic charge orders at both integer and fractional fillings have been discovered. However, the impact of charging effects on excitons trapped in moiré potentials is poorly understood. Here, we report the observation of moiré trions and their doping-dependent photoluminescence polarization in H-stacked MoSe2/WSe2 heterobilayers. We find that as moiré traps are filled with either electrons or holes, new sets of interlayer exciton photoluminescence peaks with narrow linewidths emerge about 7 meV below the energy of the neutral moiré excitons. Circularly polarized photoluminescence reveals switching from co-circular to cross-circular polarizations as moiré excitons go from being negatively charged and neutral to positively charged. Furthermore, this switching results from the competition between valley-flip and spin-flip energy relaxation pathways of photo-excited electrons during interlayer trion formation. Our results offer a starting point for engineering both bosonic and fermionic many-body effects based on moiré excitons.},

  doi          = {10.1038/s41565-021-00969-2},

  journal      = {Nature Nanotechnology},

  number       = 11,

  volume       = 16,

  place        = {United States},

  year         = {Thu Sep 16 00:00:00 EDT 2021},

  month        = {Thu Sep 16 00:00:00 EDT 2021}

}

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Title: Moiré trions in MoSe2/WSe2 heterobilayers

Abstract

Citation Formats

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Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe 2 /MoSe 2 Heterostructure journal, December 2019

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Title: Moiré trions in MoSe₂/WSe₂ heterobilayers

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journal, January 2017