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^*

^*此作品的通讯作者

National University of Singapore
Nanyang Technological University
Sun Yat-Sen University
Fudan University
University of Electronic Science and Technology of China
University of Chinese Academy of Sciences

科研成果: 期刊稿件 › 文章 › 同行评审

24 引用（Scopus）

摘要

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.

源语言	英语
页（从-至）	203-210
页数	8
期刊	Nano Letters
卷	22
期	1
DOI	https://doi.org/10.1021/acs.nanolett.1c03622
出版状态	已出版 - 12 1月 2022
已对外发布	是

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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{395d936bbdde46f892f52a097a25ba06,

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

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 = "英语",

volume = "22",

pages = "203--210",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "1",

}

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, 卷 22, 号码 1, 页码 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 - Twistronics

KW - commensuration

KW - moiré excitons

KW - scanning transmission electron microscopy

KW - twisted 2D homobilayers

UR - https://www.scopus.com/pages/publications/85121922236

U2 - 10.1021/acs.nanolett.1c03622

DO - 10.1021/acs.nanolett.1c03622

M3 - 文章

C2 - 34928607

AN - SCOPUS:85121922236

SN - 1530-6984

VL - 22

SP - 203

EP - 210

JO - Nano Letters

JF - Nano Letters

IS - 1

ER -

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

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