Author
Listed:
- Mit H. Naik
(University of California at Berkeley
Lawrence Berkeley National Laboratory)
- Emma C. Regan
(University of California at Berkeley
Lawrence Berkeley National Laboratory
University of California at Berkeley)
- Zuocheng Zhang
(University of California at Berkeley)
- Yang-Hao Chan
(University of California at Berkeley
Lawrence Berkeley National Laboratory
National Center for Theoretical Sciences)
- Zhenglu Li
(University of California at Berkeley
Lawrence Berkeley National Laboratory)
- Danqing Wang
(University of California at Berkeley
University of California at Berkeley)
- Yoseob Yoon
(University of California at Berkeley
Lawrence Berkeley National Laboratory)
- Chin Shen Ong
(University of California at Berkeley
Lawrence Berkeley National Laboratory)
- Wenyu Zhao
(University of California at Berkeley)
- Sihan Zhao
(Zhejiang University)
- M. Iqbal Bakti Utama
(University of California at Berkeley
Lawrence Berkeley National Laboratory
University of California at Berkeley)
- Beini Gao
(University of California at Berkeley)
- Xin Wei
(University of California at Berkeley)
- Mohammed Sayyad
(Arizona State University)
- Kentaro Yumigeta
(University of California at Berkeley)
- Kenji Watanabe
(National Institute for Materials Science
National Institute for Materials Science)
- Takashi Taniguchi
(National Institute for Materials Science
National Institute for Materials Science)
- Sefaattin Tongay
(Arizona State University)
- Felipe H. Jornada
(Stanford University)
- 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)
- Steven G. Louie
(University of California at Berkeley
Lawrence Berkeley National Laboratory)
Abstract
Moiré patterns of transition metal dichalcogenide heterobilayers have proved to be an ideal platform on which to host unusual correlated electronic phases, emerging magnetism and correlated exciton physics. Whereas the existence of new moiré excitonic states is established1–4 through optical measurements, the microscopic nature of these states is still poorly understood, often relying on empirically fit models. Here, combining large-scale first-principles GW (where G and W denote the one-particle Green's function and the screened Coulomb interaction, respectively) plus Bethe–Salpeter calculations and micro-reflection spectroscopy, we identify the nature of the exciton resonances in WSe2/WS2 moiré superlattices, discovering a rich set of moiré excitons that cannot be captured by prevailing continuum models. Our calculations show moiré excitons with distinct characters, including modulated Wannier excitons and previously unidentified intralayer charge-transfer excitons. Signatures of these distinct excitonic characters are confirmed experimentally by the unique carrier-density and magnetic-field dependences of different moiré exciton resonances. Our study highlights the highly non-trivial exciton states that can emerge in transition metal dichalcogenide moiré superlattices, and suggests new ways of tuning many-body physics in moiré systems by engineering excited-states with specific spatial characters.
Suggested Citation
Mit H. Naik & Emma C. Regan & Zuocheng Zhang & Yang-Hao Chan & Zhenglu Li & Danqing Wang & Yoseob Yoon & Chin Shen Ong & Wenyu Zhao & Sihan Zhao & M. Iqbal Bakti Utama & Beini Gao & Xin Wei & Mohammed, 2022.
"Intralayer charge-transfer moiré excitons in van der Waals superlattices,"
Nature, Nature, vol. 609(7925), pages 52-57, September.
Handle:
RePEc:nat:nature:v:609:y:2022:i:7925:d:10.1038_s41586-022-04991-9
DOI: 10.1038/s41586-022-04991-9
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Citations
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Cited by:
- Madeline Winkle & Isaac M. Craig & Stephen Carr & Medha Dandu & Karen C. Bustillo & Jim Ciston & Colin Ophus & Takashi Taniguchi & Kenji Watanabe & Archana Raja & Sinéad M. Griffin & D. Kwabena Bediak, 2023.
"Rotational and dilational reconstruction in transition metal dichalcogenide moiré bilayers,"
Nature Communications, Nature, vol. 14(1), pages 1-11, December.
- 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.
- Richen Xiong & Samuel L. Brantly & Kaixiang Su & Jacob H. Nie & Zihan Zhang & Rounak Banerjee & Hayley Ruddick & Kenji Watanabe & Takashi Taniguchi & Seth Ariel Tongay & Cenke Xu & Chenhao Jin, 2024.
"Tunable exciton valley-pseudospin orders in moiré superlattices,"
Nature Communications, Nature, vol. 15(1), pages 1-10, December.
- Xiaotong Chen & Zhen Lian & Yuze Meng & Lei Ma & Su-Fei Shi, 2023.
"Excitonic Complexes in Two-Dimensional Transition Metal Dichalcogenides,"
Nature Communications, Nature, vol. 14(1), pages 1-5, December.
- 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.
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