Strong interaction between interlayer excitons and correlated electrons in WSe2/WS2 moiré superlattice

Shengnan Miao; Tianmeng Wang; Xiong Huang; Dongxue Chen; Zhen Lian; Chong Wang; Mark Blei; Takashi Taniguchi; Kenji Watanabe; Sefaattin Tongay; Zenghui Wang; Di Xiao; Yong Tao Cui; Su Fei Shi

doi:10.1038/s41467-021-23732-6

Strong interaction between interlayer excitons and correlated electrons in WSe₂/WS₂ moiré superlattice

Shengnan Miao, Tianmeng Wang, Xiong Huang, Dongxue Chen, Zhen Lian, Chong Wang, Mark Blei, Takashi Taniguchi, Kenji Watanabe, Sefaattin Tongay, Zenghui Wang, Di Xiao, Yong Tao Cui, Su Fei Shi

Engineering, Ira A. Fulton Schools of (IAFSE)

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

Heterobilayers of transition metal dichalcogenides (TMDCs) can form a moiré superlattice with flat minibands, which enables strong electron interaction and leads to various fascinating correlated states. These heterobilayers also host interlayer excitons in a type-II band alignment, in which optically excited electrons and holes reside on different layers but remain bound by the Coulomb interaction. Here we explore the unique setting of interlayer excitons interacting with strongly correlated electrons, and we show that the photoluminescence (PL) of interlayer excitons sensitively signals the onset of various correlated insulating states as the band filling is varied. When the system is in one of such states, the PL of interlayer excitons is relatively amplified at increased optical excitation power due to reduced mobility, and the valley polarization of interlayer excitons is enhanced. The moiré superlattice of the TMDC heterobilayer presents an exciting platform to engineer interlayer excitons through the periodic correlated electron states.

Original language	English (US)
Article number	3608
Journal	Nature communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-021-23732-6
State	Published - Dec 1 2021

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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10.1038/s41467-021-23732-6

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title = "Strong interaction between interlayer excitons and correlated electrons in WSe2/WS2 moir{\'e} superlattice",

abstract = "Heterobilayers of transition metal dichalcogenides (TMDCs) can form a moir{\'e} superlattice with flat minibands, which enables strong electron interaction and leads to various fascinating correlated states. These heterobilayers also host interlayer excitons in a type-II band alignment, in which optically excited electrons and holes reside on different layers but remain bound by the Coulomb interaction. Here we explore the unique setting of interlayer excitons interacting with strongly correlated electrons, and we show that the photoluminescence (PL) of interlayer excitons sensitively signals the onset of various correlated insulating states as the band filling is varied. When the system is in one of such states, the PL of interlayer excitons is relatively amplified at increased optical excitation power due to reduced mobility, and the valley polarization of interlayer excitons is enhanced. The moir{\'e} superlattice of the TMDC heterobilayer presents an exciting platform to engineer interlayer excitons through the periodic correlated electron states.",

author = "Shengnan Miao and Tianmeng Wang and Xiong Huang and Dongxue Chen and Zhen Lian and Chong Wang and Mark Blei and Takashi Taniguchi and Kenji Watanabe and Sefaattin Tongay and Zenghui Wang and Di Xiao and Cui, {Yong Tao} and Shi, {Su Fei}",

note = "Funding Information: We thank Dr. Chenhao Jin and Prof. Feng Wang for helpful discussions. S.M. and S.-F.S. acknowledge support by AFOSR through Grant FA9550-18-1-0312 and by NSF through Career Grant DMR-1945420. T.W. and S.-F.S. acknowledge support from ACS PRF through Grant 59957-DNI10. Z.L. and S.-F.S. acknowledge support from NYSTAR through Focus Center-NY–RPI Contract C150117. The device fabrication was supported by the Micro and Nanofabrication Clean Room (MNCR) at Rensselaer Polytechnic Institute (RPI). The optical characterization is supported by a DURIP award (AFRL FA9550-20-1-0179). D.C. and Z.W. acknowledges support from China Postdoctoral Science Foundation (Grant number 2019M653380), National Natural Science Foundation of China (Grant number 62004032, 61774029) and Sichuan Provincial Science and Technology Department (grants 21CXTD0088, 21YYJC3079, 2019JDTD0006 and 2019YFSY0007). X.H. and Y.-T.C. acknowledge support from NSF under award DMR-2004701. D.X. is supported by the Department of Energy, Basic Energy Sciences, Grant number DE-SC0012509. S.T. acknowledges support from NSF DMR-1904716, DMR-1838443, CMMI-1933214, and DOE-SC0020653. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant number JPMXP0112101001, JSPS KAKENHI Grant number JP20H00354, and the CREST (JPMJCR15F3), JST. Publisher Copyright: {\textcopyright} 2021, The Author(s).",

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doi = "10.1038/s41467-021-23732-6",

language = "English (US)",

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T1 - Strong interaction between interlayer excitons and correlated electrons in WSe2/WS2 moiré superlattice

AU - Miao, Shengnan

AU - Wang, Tianmeng

AU - Huang, Xiong

AU - Chen, Dongxue

AU - Lian, Zhen

AU - Wang, Chong

AU - Blei, Mark

AU - Taniguchi, Takashi

AU - Watanabe, Kenji

AU - Tongay, Sefaattin

AU - Wang, Zenghui

AU - Xiao, Di

AU - Cui, Yong Tao

AU - Shi, Su Fei

N1 - Funding Information: We thank Dr. Chenhao Jin and Prof. Feng Wang for helpful discussions. S.M. and S.-F.S. acknowledge support by AFOSR through Grant FA9550-18-1-0312 and by NSF through Career Grant DMR-1945420. T.W. and S.-F.S. acknowledge support from ACS PRF through Grant 59957-DNI10. Z.L. and S.-F.S. acknowledge support from NYSTAR through Focus Center-NY–RPI Contract C150117. The device fabrication was supported by the Micro and Nanofabrication Clean Room (MNCR) at Rensselaer Polytechnic Institute (RPI). The optical characterization is supported by a DURIP award (AFRL FA9550-20-1-0179). D.C. and Z.W. acknowledges support from China Postdoctoral Science Foundation (Grant number 2019M653380), National Natural Science Foundation of China (Grant number 62004032, 61774029) and Sichuan Provincial Science and Technology Department (grants 21CXTD0088, 21YYJC3079, 2019JDTD0006 and 2019YFSY0007). X.H. and Y.-T.C. acknowledge support from NSF under award DMR-2004701. D.X. is supported by the Department of Energy, Basic Energy Sciences, Grant number DE-SC0012509. S.T. acknowledges support from NSF DMR-1904716, DMR-1838443, CMMI-1933214, and DOE-SC0020653. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant number JPMXP0112101001, JSPS KAKENHI Grant number JP20H00354, and the CREST (JPMJCR15F3), JST. Publisher Copyright: © 2021, The Author(s).

PY - 2021/12/1

Y1 - 2021/12/1

N2 - Heterobilayers of transition metal dichalcogenides (TMDCs) can form a moiré superlattice with flat minibands, which enables strong electron interaction and leads to various fascinating correlated states. These heterobilayers also host interlayer excitons in a type-II band alignment, in which optically excited electrons and holes reside on different layers but remain bound by the Coulomb interaction. Here we explore the unique setting of interlayer excitons interacting with strongly correlated electrons, and we show that the photoluminescence (PL) of interlayer excitons sensitively signals the onset of various correlated insulating states as the band filling is varied. When the system is in one of such states, the PL of interlayer excitons is relatively amplified at increased optical excitation power due to reduced mobility, and the valley polarization of interlayer excitons is enhanced. The moiré superlattice of the TMDC heterobilayer presents an exciting platform to engineer interlayer excitons through the periodic correlated electron states.

AB - Heterobilayers of transition metal dichalcogenides (TMDCs) can form a moiré superlattice with flat minibands, which enables strong electron interaction and leads to various fascinating correlated states. These heterobilayers also host interlayer excitons in a type-II band alignment, in which optically excited electrons and holes reside on different layers but remain bound by the Coulomb interaction. Here we explore the unique setting of interlayer excitons interacting with strongly correlated electrons, and we show that the photoluminescence (PL) of interlayer excitons sensitively signals the onset of various correlated insulating states as the band filling is varied. When the system is in one of such states, the PL of interlayer excitons is relatively amplified at increased optical excitation power due to reduced mobility, and the valley polarization of interlayer excitons is enhanced. The moiré superlattice of the TMDC heterobilayer presents an exciting platform to engineer interlayer excitons through the periodic correlated electron states.

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Strong interaction between interlayer excitons and correlated electrons in WSe₂/WS₂ moiré superlattice

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