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

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

doi:10.1038/s41467-021-23732-6

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

Journal Article · Mon Jun 14 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-23732-6· OSTI ID:1816292

Miao, Shengnan ^[1];

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^[2]; Chen, Dongxue ^[3]; Lian, Zhen ^[1]; Wang, Chong ^[4]; Blei, Mark ^[5];

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Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Chemical and Biological Engineering
Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy; Univ. of California, Riverside, CA (United States). Dept. of Materials Science and Engineering
Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Chemical and Biological Engineering; Univ. of Electronic Science and Technology of China, Chengdu, Sichuan (China). Inst. of Fundamental and Frontier Sciences
Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
Arizona State Univ., Tempe, AZ (United States). School of Engineering of Matter, Transport and Energy
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Research Center for Functional Materials
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). International Center for Materials Nanoarchitectonics
Univ. of Electronic Science and Technology of China, Chengdu, Sichuan (China). Inst. of Fundamental and Frontier Sciences
Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy
Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Chemical and Biological Engineering; Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Electrical, Computer and Systems Engineering

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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Research Organization:: Arizona State Univ., Tempe, AZ (United States)

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

Grant/Contract Number:: SC0012509; SC0020653

OSTI ID:: 1816292

Journal Information:: Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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