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Observation of moiré excitons in WSe2/WS2 heterostructure superlattices

Author

Listed:
  • Chenhao Jin

    (University of California at Berkeley)

  • Emma C. Regan

    (University of California at Berkeley
    University of California at Berkeley)

  • Aiming Yan

    (University of California at Berkeley
    Lawrence Berkeley National Laboratory)

  • M. Iqbal Bakti Utama

    (University of California at Berkeley
    University of California at Berkeley)

  • Danqing Wang

    (University of California at Berkeley
    University of California at Berkeley)

  • Sihan Zhao

    (University of California at Berkeley)

  • Ying Qin

    (Transport and Energy, Arizona State University)

  • Sijie Yang

    (Transport and Energy, Arizona State University)

  • Zhiren Zheng

    (University of California at Berkeley)

  • Shenyang Shi

    (University of California at Berkeley
    Fudan University)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Sefaattin Tongay

    (Transport and Energy, Arizona State University)

  • Alex Zettl

    (University of California at Berkeley
    Lawrence Berkeley National Laboratory
    Kavli Energy NanoSciences Institute at University of California Berkeley and Lawrence Berkeley National Laboratory)

  • Feng Wang

    (University of California at Berkeley
    Lawrence Berkeley National Laboratory
    Kavli Energy NanoSciences Institute at University of California Berkeley and Lawrence Berkeley National Laboratory)

Abstract

Moiré superlattices enable the generation of new quantum phenomena in two-dimensional heterostructures, in which the interactions between the atomically thin layers qualitatively change the electronic band structure of the superlattice. For example, mini-Dirac points, tunable Mott insulator states and the Hofstadter butterfly pattern can emerge in different types of graphene/boron nitride moiré superlattices, whereas correlated insulating states and superconductivity have been reported in twisted bilayer graphene moiré superlattices1–12. In addition to their pronounced effects on single-particle states, moiré superlattices have recently been predicted to host excited states such as moiré exciton bands13–15. Here we report the observation of moiré superlattice exciton states in tungsten diselenide/tungsten disulfide (WSe2/WS2) heterostructures in which the layers are closely aligned. These moiré exciton states manifest as multiple emergent peaks around the original WSe2 A exciton resonance in the absorption spectra, and they exhibit gate dependences that are distinct from that of the A exciton in WSe2 monolayers and in WSe2/WS2 heterostructures with large twist angles. These phenomena can be described by a theoretical model in which the periodic moiré potential is much stronger than the exciton kinetic energy and generates multiple flat exciton minibands. The moiré exciton bands provide an attractive platform from which to explore and control excited states of matter, such as topological excitons and a correlated exciton Hubbard model, in transition-metal dichalcogenides.

Suggested Citation

  • Chenhao Jin & Emma C. Regan & Aiming Yan & M. Iqbal Bakti Utama & Danqing Wang & Sihan Zhao & Ying Qin & Sijie Yang & Zhiren Zheng & Shenyang Shi & Kenji Watanabe & Takashi Taniguchi & Sefaattin Tonga, 2019. "Observation of moiré excitons in WSe2/WS2 heterostructure superlattices," Nature, Nature, vol. 567(7746), pages 76-80, March.
  • Handle: RePEc:nat:nature:v:567:y:2019:i:7746:d:10.1038_s41586-019-0976-y
    DOI: 10.1038/s41586-019-0976-y
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    Cited by:

    1. Mengqi Huang & Zeliang Sun & Gerald Yan & Hongchao Xie & Nishkarsh Agarwal & Gaihua Ye & Suk Hyun Sung & Hanyi Lu & Jingcheng Zhou & Shaohua Yan & Shangjie Tian & Hechang Lei & Robert Hovden & Rui He , 2023. "Revealing intrinsic domains and fluctuations of moiré magnetism by a wide-field quantum microscope," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Ruoming Peng & Adina Ripin & Yusen Ye & Jiayi Zhu & Changming Wu & Seokhyeong Lee & Huan Li & Takashi Taniguchi & Kenji Watanabe & Ting Cao & Xiaodong Xu & Mo Li, 2022. "Long-range transport of 2D excitons with acoustic waves," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    3. Jinjae Kim & Jiwon Park & Hyojin Choi & Taeho Kim & Soonyoung Cha & Yewon Lee & Kenji Watanabe & Takashi Taniguchi & Jonghwan Kim & Moon-Ho Jo & Hyunyong Choi, 2024. "Correlation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    4. Hulin Yao & Pengcheng Zheng & Shibin Zhang & Chuanjie Hu & Xiaoli Fang & Liping Zhang & Dan Ling & Huanyang Chen & Xin Ou, 2024. "Twist piezoelectricity: giant electromechanical coupling in magic-angle twisted bilayer LiNbO3," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    5. Yufei Sun & Yujia Wang & Enze Wang & Bolun Wang & Hengyi Zhao & Yongpan Zeng & Qinghua Zhang & Yonghuang Wu & Lin Gu & Xiaoyan Li & Kai Liu, 2022. "Determining the interlayer shearing in twisted bilayer MoS2 by nanoindentation," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    6. N. Fang & Y. R. Chang & S. Fujii & D. Yamashita & M. Maruyama & Y. Gao & C. F. Fong & D. Kozawa & K. Otsuka & K. Nagashio & S. Okada & Y. K. Kato, 2024. "Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    7. Veronica R. Policht & Henry Mittenzwey & Oleg Dogadov & Manuel Katzer & Andrea Villa & Qiuyang Li & Benjamin Kaiser & Aaron M. Ross & Francesco Scotognella & Xiaoyang Zhu & Andreas Knorr & Malte Selig, 2023. "Time-domain observation of interlayer exciton formation and thermalization in a MoSe2/WSe2 heterostructure," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    8. Hongbing Cai & Abdullah Rasmita & Qinghai Tan & Jia-Min Lai & Ruihua He & Xiangbin Cai & Yan Zhao & Disheng Chen & Naizhou Wang & Zhao Mu & Zumeng Huang & Zhaowei Zhang & John J. H. Eng & Yuanda Liu &, 2023. "Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    9. Zhen Lian & Dongxue Chen & Yuze Meng & Xiaotong Chen & Ying Su & Rounak Banerjee & Takashi Taniguchi & Kenji Watanabe & Sefaattin Tongay & Chuanwei Zhang & Yong-Tao Cui & Su-Fei Shi, 2023. "Exciton Superposition across Moiré States in a Semiconducting Moiré Superlattice," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    10. Zhiwen Zhou & E. A. Szwed & D. J. Choksy & L. H. Fowler-Gerace & L. V. Butov, 2024. "Long-distance decay-less spin transport in indirect excitons in a van der Waals heterostructure," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    11. Qiaoling Lin & Hanlin Fang & Alexei Kalaboukhov & Yuanda Liu & Yi Zhang & Moritz Fischer & Juntao Li & Joakim Hagel & Samuel Brem & Ermin Malic & Nicolas Stenger & Zhipei Sun & Martijn Wubs & Sanshui , 2024. "Moiré-engineered light-matter interactions in MoS2/WSe2 heterobilayers at room temperature," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    12. Valerio Di Giulio & P. A. D. Gonçalves & F. Javier García de Abajo, 2022. "An image interaction approach to quantum-phase engineering of two-dimensional materials," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    13. Junxiong Hu & Junyou Tan & Mohammed M. Al Ezzi & Udvas Chattopadhyay & Jian Gou & Yuntian Zheng & Zihao Wang & Jiayu Chen & Reshmi Thottathil & Jiangbo Luo & Kenji Watanabe & Takashi Taniguchi & Andre, 2023. "Controlled alignment of supermoiré lattice in double-aligned graphene heterostructures," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    14. Riya Sebait & Roberto Rosati & Seok Joon Yun & Krishna P. Dhakal & Samuel Brem & Chandan Biswas & Alexander Puretzky & Ermin Malic & Young Hee Lee, 2023. "Sequential order dependent dark-exciton modulation in bi-layered TMD heterostructure," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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