Strong Moiré Excitons in High-Angle Twisted Transition Metal Dichalcogenide Homobilayers with Robust Commensuration

Xiaoxu Zhao; Jingsi Qiao; Xin Zhou; Hao Chen; Jun You Tan; Hongyi Yu; Si Min Chan; Jing Li; Henshui Zhang; Jiadong Zhou; Jiadong Dan; Zhen Liu; Wu Zhou; Zheng Liu; Bo Peng; Longjiang Deng; Stephen John Pennycook; Su Ying Quek; Kian Ping Loh

doi:10.1021/acs.nanolett.1c03622

Strong Moiré Excitons in High-Angle Twisted Transition Metal Dichalcogenide Homobilayers with Robust Commensuration

Xiaoxu Zhao, Jingsi Qiao, Xin Zhou, Hao Chen, Jun You Tan, Hongyi Yu, Si Min Chan, Jing Li, Henshui Zhang, Jiadong Zhou, Jiadong Dan, Zhen Liu, Wu Zhou, Zheng Liu, Bo Peng^*, Longjiang Deng, Stephen John Pennycook, Su Ying Quek, Kian Ping Loh^*

^*Corresponding author for this work

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

16 Citations (Scopus)

Abstract

The burgeoning field of twistronics, which concerns how changing the relative twist angles between two materials creates new optoelectronic properties, offers a novel platform for studying twist-angle dependent excitonic physics. Herein, by surveying a range of hexagonal phase transition metal dichalcogenides (TMD) twisted homobilayers, we find that 21.8 ± 1.0°-twisted (Formula Presented) and 27.8 ± 1.0°-twisted (Formula Presented) bilayers account for nearly 20% of the total population of twisted bilayers in solution-phase restacked bilayers and can be found also in chemical vapor deposition (CVD) samples. Examining the optical properties associated with these twisted angles, we found that 21.8 ± 1.0° twisted MoS₂ bilayers exhibit an intense moiré exciton peak in the photoluminescence (PL) spectra, originating from the refolded Brillouin zones. Our work suggests that commensurately twisted TMD homobilayers with short commensurate wavelengths can have interesting optoelectronic properties that are different from the small twist angle counterparts.

Original language	English
Pages (from-to)	203-210
Number of pages	8
Journal	Nano Letters
Volume	22
Issue number	1
DOIs	https://doi.org/10.1021/acs.nanolett.1c03622
Publication status	Published - Jan 12 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society

ASJC Scopus Subject Areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

Keywords

commensuration
moiré excitons
scanning transmission electron microscopy
twisted 2D homobilayers
Twistronics

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10.1021/acs.nanolett.1c03622

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Zhao, X., Qiao, J., Zhou, X., Chen, H., Tan, J. Y., Yu, H., Chan, S. M., Li, J., Zhang, H., Zhou, J., Dan, J., Liu, Z., Zhou, W., Liu, Z., Peng, B., Deng, L., Pennycook, S. J., Quek, S. Y., & Loh, K. P. (2022). Strong Moiré Excitons in High-Angle Twisted Transition Metal Dichalcogenide Homobilayers with Robust Commensuration. Nano Letters, 22(1), 203-210. https://doi.org/10.1021/acs.nanolett.1c03622

@article{33f577df9c7c40698af10ec4cabb5f29,

title = "Strong Moir{\'e} Excitons in High-Angle Twisted Transition Metal Dichalcogenide Homobilayers with Robust Commensuration",

abstract = "The burgeoning field of twistronics, which concerns how changing the relative twist angles between two materials creates new optoelectronic properties, offers a novel platform for studying twist-angle dependent excitonic physics. Herein, by surveying a range of hexagonal phase transition metal dichalcogenides (TMD) twisted homobilayers, we find that 21.8 ± 1.0°-twisted (Formula Presented) and 27.8 ± 1.0°-twisted (Formula Presented) bilayers account for nearly 20% of the total population of twisted bilayers in solution-phase restacked bilayers and can be found also in chemical vapor deposition (CVD) samples. Examining the optical properties associated with these twisted angles, we found that 21.8 ± 1.0° twisted MoS2 bilayers exhibit an intense moir{\'e} exciton peak in the photoluminescence (PL) spectra, originating from the refolded Brillouin zones. Our work suggests that commensurately twisted TMD homobilayers with short commensurate wavelengths can have interesting optoelectronic properties that are different from the small twist angle counterparts.",

keywords = "commensuration, moir{\'e} excitons, scanning transmission electron microscopy, twisted 2D homobilayers, Twistronics",

author = "Xiaoxu Zhao and Jingsi Qiao and Xin Zhou and Hao Chen and Tan, {Jun You} and Hongyi Yu and Chan, {Si Min} and Jing Li and Henshui Zhang and Jiadong Zhou and Jiadong Dan and Zhen Liu and Wu Zhou and Zheng Liu and Bo Peng and Longjiang Deng and Pennycook, {Stephen John} and Quek, {Su Ying} and Loh, {Kian Ping}",

note = "Publisher Copyright: {\textcopyright} 2021 American Chemical Society",

year = "2022",

month = jan,

day = "12",

doi = "10.1021/acs.nanolett.1c03622",

language = "English",

volume = "22",

pages = "203--210",

journal = "Nano Letters",

issn = "1530-6984",

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Zhao, X, Qiao, J, Zhou, X, Chen, H, Tan, JY, Yu, H, Chan, SM, Li, J, Zhang, H, Zhou, J, Dan, J, Liu, Z, Zhou, W, Liu, Z, Peng, B, Deng, L, Pennycook, SJ, Quek, SY & Loh, KP 2022, 'Strong Moiré Excitons in High-Angle Twisted Transition Metal Dichalcogenide Homobilayers with Robust Commensuration', Nano Letters, vol. 22, no. 1, pp. 203-210. https://doi.org/10.1021/acs.nanolett.1c03622

TY - JOUR

T1 - Strong Moiré Excitons in High-Angle Twisted Transition Metal Dichalcogenide Homobilayers with Robust Commensuration

AU - Zhao, Xiaoxu

AU - Qiao, Jingsi

AU - Zhou, Xin

AU - Chen, Hao

AU - Tan, Jun You

AU - Yu, Hongyi

AU - Chan, Si Min

AU - Li, Jing

AU - Zhang, Henshui

AU - Zhou, Jiadong

AU - Dan, Jiadong

AU - Liu, Zhen

AU - Zhou, Wu

AU - Liu, Zheng

AU - Peng, Bo

AU - Deng, Longjiang

AU - Pennycook, Stephen John

AU - Quek, Su Ying

AU - Loh, Kian Ping

PY - 2022/1/12

Y1 - 2022/1/12

N2 - The burgeoning field of twistronics, which concerns how changing the relative twist angles between two materials creates new optoelectronic properties, offers a novel platform for studying twist-angle dependent excitonic physics. Herein, by surveying a range of hexagonal phase transition metal dichalcogenides (TMD) twisted homobilayers, we find that 21.8 ± 1.0°-twisted (Formula Presented) and 27.8 ± 1.0°-twisted (Formula Presented) bilayers account for nearly 20% of the total population of twisted bilayers in solution-phase restacked bilayers and can be found also in chemical vapor deposition (CVD) samples. Examining the optical properties associated with these twisted angles, we found that 21.8 ± 1.0° twisted MoS2 bilayers exhibit an intense moiré exciton peak in the photoluminescence (PL) spectra, originating from the refolded Brillouin zones. Our work suggests that commensurately twisted TMD homobilayers with short commensurate wavelengths can have interesting optoelectronic properties that are different from the small twist angle counterparts.

AB - The burgeoning field of twistronics, which concerns how changing the relative twist angles between two materials creates new optoelectronic properties, offers a novel platform for studying twist-angle dependent excitonic physics. Herein, by surveying a range of hexagonal phase transition metal dichalcogenides (TMD) twisted homobilayers, we find that 21.8 ± 1.0°-twisted (Formula Presented) and 27.8 ± 1.0°-twisted (Formula Presented) bilayers account for nearly 20% of the total population of twisted bilayers in solution-phase restacked bilayers and can be found also in chemical vapor deposition (CVD) samples. Examining the optical properties associated with these twisted angles, we found that 21.8 ± 1.0° twisted MoS2 bilayers exhibit an intense moiré exciton peak in the photoluminescence (PL) spectra, originating from the refolded Brillouin zones. Our work suggests that commensurately twisted TMD homobilayers with short commensurate wavelengths can have interesting optoelectronic properties that are different from the small twist angle counterparts.

KW - commensuration

KW - moiré excitons

KW - scanning transmission electron microscopy

KW - twisted 2D homobilayers

KW - Twistronics

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AN - SCOPUS:85121922236

SN - 1530-6984

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JO - Nano Letters

JF - Nano Letters

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Strong Moiré Excitons in High-Angle Twisted Transition Metal Dichalcogenide Homobilayers with Robust Commensuration

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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