Heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene

Abstract The ability to precisely control moiré patterns in two-dimensional materials has enabled the realization of unprecedented physical phenomena including Mott insulators, unconventional superconductivity, and quantum emission. Along with the twist angle, the application of independent strain i...

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Autores principales:	Xuejiao Gao, Hao Sun, Dong-Ho Kang, Chongwu Wang, Qi Jie Wang, Donguk Nam
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f2aedc7460094301b6802eb3419b3473
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spelling	oai:doaj.org-article:f2aedc7460094301b6802eb3419b34732021-11-08T10:49:26ZHeterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene10.1038/s41598-021-00757-x2045-2322https://doaj.org/article/f2aedc7460094301b6802eb3419b34732021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-00757-xhttps://doaj.org/toc/2045-2322Abstract The ability to precisely control moiré patterns in two-dimensional materials has enabled the realization of unprecedented physical phenomena including Mott insulators, unconventional superconductivity, and quantum emission. Along with the twist angle, the application of independent strain in each layer of stacked two-dimensional materials—termed heterostrain—has become a powerful means to manipulate the moiré potential landscapes. Recent experimental studies have demonstrated the possibility of continuously tuning the twist angle and the resulting physical properties. However, the dynamic control of heterostrain that allows the on-demand manipulation of moiré superlattices has yet to be experimentally realized. Here, by harnessing the weak interlayer van der Waals bonding in twisted bilayer graphene devices, we demonstrate the realization of dynamically tunable heterostrain of up to 1.3%. Polarization-resolved Raman spectroscopy confirmed the existence of substantial heterostrain by presenting triple G peaks arising from the independently strained graphene layers. Theoretical calculations revealed that the distorted moiré patterns via heterostrain can significantly alter the electronic structure of twisted bilayer graphene, allowing the emergence of multiple absorption peaks ranging from near-infrared to visible spectral ranges. Our experimental demonstration presents a new degree of freedom towards the dynamic modulation of moiré superlattices, holding the promise to unveil unprecedented physics and applications of stacked two-dimensional materials.Xuejiao GaoHao SunDong-Ho KangChongwu WangQi Jie WangDonguk NamNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xuejiao Gao Hao Sun Dong-Ho Kang Chongwu Wang Qi Jie Wang Donguk Nam Heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene
description	Abstract The ability to precisely control moiré patterns in two-dimensional materials has enabled the realization of unprecedented physical phenomena including Mott insulators, unconventional superconductivity, and quantum emission. Along with the twist angle, the application of independent strain in each layer of stacked two-dimensional materials—termed heterostrain—has become a powerful means to manipulate the moiré potential landscapes. Recent experimental studies have demonstrated the possibility of continuously tuning the twist angle and the resulting physical properties. However, the dynamic control of heterostrain that allows the on-demand manipulation of moiré superlattices has yet to be experimentally realized. Here, by harnessing the weak interlayer van der Waals bonding in twisted bilayer graphene devices, we demonstrate the realization of dynamically tunable heterostrain of up to 1.3%. Polarization-resolved Raman spectroscopy confirmed the existence of substantial heterostrain by presenting triple G peaks arising from the independently strained graphene layers. Theoretical calculations revealed that the distorted moiré patterns via heterostrain can significantly alter the electronic structure of twisted bilayer graphene, allowing the emergence of multiple absorption peaks ranging from near-infrared to visible spectral ranges. Our experimental demonstration presents a new degree of freedom towards the dynamic modulation of moiré superlattices, holding the promise to unveil unprecedented physics and applications of stacked two-dimensional materials.
format	article
author	Xuejiao Gao Hao Sun Dong-Ho Kang Chongwu Wang Qi Jie Wang Donguk Nam
author_facet	Xuejiao Gao Hao Sun Dong-Ho Kang Chongwu Wang Qi Jie Wang Donguk Nam
author_sort	Xuejiao Gao
title	Heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene
title_short	Heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene
title_full	Heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene
title_fullStr	Heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene
title_full_unstemmed	Heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene
title_sort	heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f2aedc7460094301b6802eb3419b3473
work_keys_str_mv	AT xuejiaogao heterostrainenableddynamicallytunablemoiresuperlatticeintwistedbilayergraphene AT haosun heterostrainenableddynamicallytunablemoiresuperlatticeintwistedbilayergraphene AT donghokang heterostrainenableddynamicallytunablemoiresuperlatticeintwistedbilayergraphene AT chongwuwang heterostrainenableddynamicallytunablemoiresuperlatticeintwistedbilayergraphene AT qijiewang heterostrainenableddynamicallytunablemoiresuperlatticeintwistedbilayergraphene AT donguknam heterostrainenableddynamicallytunablemoiresuperlatticeintwistedbilayergraphene
_version_	1718442672327229440

Heterostrain-enabled dynamically tunable moiré superlattice in twisted bilayer graphene

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