The trilayer exciton emission in WSe2/WS2/MoS2van der Waals heterostructures

Ming Xin; Wenze Lan; Qinghu Bai; Xin Huang; Kenji Watanabe; Takashi Taniguchi; Gang Wang; Changzhi Gu; Baoli Liu

doi:10.1063/5.0108185

The trilayer exciton emission in WSe₂/WS₂/MoS₂van der Waals heterostructures

Ming Xin, Wenze Lan, Qinghu Bai, Xin Huang, Kenji Watanabe, Takashi Taniguchi, Gang Wang, Changzhi Gu, Baoli Liu^*

^*Corresponding author for this work

School of Physics

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

3 Citations (Scopus)

Abstract

In this Letter, we present the experimental observation of trilayer exciton emission in the WSe2/WS2/MoS2 heterostructures by photoluminescence spectroscopy at a low temperature of ∼10 K. It is found that the trilayer exciton has a lower exciton binding energy than that in the WSe2/MoS2 heterobilayer due to the insertion of monolayer WS2, which is manifested by the blueshift of this trilayer exciton peak relative to the bilayer exciton. Through the measurements of the exciton peak position as a function of excitation power, the trilayer excitons exhibited the density-dependent repulsive interaction among them, and the reduction of binding energy ∼8 meV is deduced. Moreover, the trilayer exciton has a longer lifetime than the bilayer exciton, resulting from the reduction of electron-hole wavefunction overlap.

Original language	English
Article number	143101
Journal	Applied Physics Letters
Volume	121
Issue number	14
DOIs	https://doi.org/10.1063/5.0108185
Publication status	Published - 3 Oct 2022

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title = "The trilayer exciton emission in WSe2/WS2/MoS2van der Waals heterostructures",

abstract = "In this Letter, we present the experimental observation of trilayer exciton emission in the WSe2/WS2/MoS2 heterostructures by photoluminescence spectroscopy at a low temperature of ∼10 K. It is found that the trilayer exciton has a lower exciton binding energy than that in the WSe2/MoS2 heterobilayer due to the insertion of monolayer WS2, which is manifested by the blueshift of this trilayer exciton peak relative to the bilayer exciton. Through the measurements of the exciton peak position as a function of excitation power, the trilayer excitons exhibited the density-dependent repulsive interaction among them, and the reduction of binding energy ∼8 meV is deduced. Moreover, the trilayer exciton has a longer lifetime than the bilayer exciton, resulting from the reduction of electron-hole wavefunction overlap.",

author = "Ming Xin and Wenze Lan and Qinghu Bai and Xin Huang and Kenji Watanabe and Takashi Taniguchi and Gang Wang and Changzhi Gu and Baoli Liu",

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T1 - The trilayer exciton emission in WSe2/WS2/MoS2van der Waals heterostructures

AU - Xin, Ming

AU - Lan, Wenze

AU - Bai, Qinghu

AU - Huang, Xin

AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Wang, Gang

AU - Gu, Changzhi

AU - Liu, Baoli

PY - 2022/10/3

Y1 - 2022/10/3

N2 - In this Letter, we present the experimental observation of trilayer exciton emission in the WSe2/WS2/MoS2 heterostructures by photoluminescence spectroscopy at a low temperature of ∼10 K. It is found that the trilayer exciton has a lower exciton binding energy than that in the WSe2/MoS2 heterobilayer due to the insertion of monolayer WS2, which is manifested by the blueshift of this trilayer exciton peak relative to the bilayer exciton. Through the measurements of the exciton peak position as a function of excitation power, the trilayer excitons exhibited the density-dependent repulsive interaction among them, and the reduction of binding energy ∼8 meV is deduced. Moreover, the trilayer exciton has a longer lifetime than the bilayer exciton, resulting from the reduction of electron-hole wavefunction overlap.

AB - In this Letter, we present the experimental observation of trilayer exciton emission in the WSe2/WS2/MoS2 heterostructures by photoluminescence spectroscopy at a low temperature of ∼10 K. It is found that the trilayer exciton has a lower exciton binding energy than that in the WSe2/MoS2 heterobilayer due to the insertion of monolayer WS2, which is manifested by the blueshift of this trilayer exciton peak relative to the bilayer exciton. Through the measurements of the exciton peak position as a function of excitation power, the trilayer excitons exhibited the density-dependent repulsive interaction among them, and the reduction of binding energy ∼8 meV is deduced. Moreover, the trilayer exciton has a longer lifetime than the bilayer exciton, resulting from the reduction of electron-hole wavefunction overlap.

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JF - Applied Physics Letters

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M1 - 143101

ER -

The trilayer exciton emission in WSe₂/WS₂/MoS₂van der Waals heterostructures

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