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 () and Su-Fei Shi ()
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Shengnan Miao: Rensselaer Polytechnic Institute
Tianmeng Wang: Rensselaer Polytechnic Institute
Xiong Huang: University of California
Dongxue Chen: Rensselaer Polytechnic Institute
Zhen Lian: Rensselaer Polytechnic Institute
Chong Wang: Carnegie Mellon University
Mark Blei: Arizona State University
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Sefaattin Tongay: Arizona State University
Zenghui Wang: University of Electronic Science and Technology of China
Di Xiao: Carnegie Mellon University
Yong-Tao Cui: University of California
Su-Fei Shi: Rensselaer Polytechnic Institute

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-23732-6

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