Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure

Abstract Electron-electron interaction is fundamental in condensed matter physics and can lead to composite quasiparticles called plasmarons, which strongly renormalize the dispersion and carry information of electron-electron coupling strength as defined by the effective fine structure constant $${...

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Autores principales:	Hongyun Zhang, Shuopei Wang, Eryin Wang, Xiaobo Lu, Qian Li, Changhua Bao, Ke Deng, Haoxiong Zhang, Wei Yao, Guorui Chen, Alexei V. Fedorov, Jonathan D. Denlinger, Kenji Watanabe, Takashi Taniguchi, Guangyu Zhang, Shuyun Zhou
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/cebe098d57f84c03b2c3b710f956c57e
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spelling	oai:doaj.org-article:cebe098d57f84c03b2c3b710f956c57e2021-12-02T17:37:31ZExperimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure10.1038/s41535-021-00386-72397-4648https://doaj.org/article/cebe098d57f84c03b2c3b710f956c57e2021-10-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00386-7https://doaj.org/toc/2397-4648Abstract Electron-electron interaction is fundamental in condensed matter physics and can lead to composite quasiparticles called plasmarons, which strongly renormalize the dispersion and carry information of electron-electron coupling strength as defined by the effective fine structure constant $${\alpha }_{ee}^{* }$$ α e e * . Although h-BN with unique dielectric properties has been widely used as an important substrate for graphene, so far there is no experimental report of plasmarons in graphene/h-BN yet. Here, we report direct experimental observation of plasmaron dispersion in graphene/h-BN heterostructures through angle-resolved photoemission spectroscopy (ARPES) measurements upon in situ electron doping. Characteristic diamond-shaped dispersion is observed near the Dirac cone in both 0° (aligned) and 13.5° (twisted) graphene/h-BN, and the electron-electron interaction strength $${\alpha }_{ee}^{* }$$ α e e * is extracted to be $${\alpha }_{ee}^{* }\approx 0.9\pm 0.1$$ α e e * ≈ 0.9 ± 0.1 , highlighting the important role of electron-electron interaction. Our results suggest graphene/h-BN as an ideal platform for investigating strong electron-electron interaction with weak dielectric screening, and lays fundamental physics for gate-tunable nano-electronics and nano-plasmonics.Hongyun ZhangShuopei WangEryin WangXiaobo LuQian LiChanghua BaoKe DengHaoxiong ZhangWei YaoGuorui ChenAlexei V. FedorovJonathan D. DenlingerKenji WatanabeTakashi TaniguchiGuangyu ZhangShuyun ZhouNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Hongyun Zhang Shuopei Wang Eryin Wang Xiaobo Lu Qian Li Changhua Bao Ke Deng Haoxiong Zhang Wei Yao Guorui Chen Alexei V. Fedorov Jonathan D. Denlinger Kenji Watanabe Takashi Taniguchi Guangyu Zhang Shuyun Zhou Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure
description	Abstract Electron-electron interaction is fundamental in condensed matter physics and can lead to composite quasiparticles called plasmarons, which strongly renormalize the dispersion and carry information of electron-electron coupling strength as defined by the effective fine structure constant $${\alpha }_{ee}^{* }$$ α e e * . Although h-BN with unique dielectric properties has been widely used as an important substrate for graphene, so far there is no experimental report of plasmarons in graphene/h-BN yet. Here, we report direct experimental observation of plasmaron dispersion in graphene/h-BN heterostructures through angle-resolved photoemission spectroscopy (ARPES) measurements upon in situ electron doping. Characteristic diamond-shaped dispersion is observed near the Dirac cone in both 0° (aligned) and 13.5° (twisted) graphene/h-BN, and the electron-electron interaction strength $${\alpha }_{ee}^{* }$$ α e e * is extracted to be $${\alpha }_{ee}^{* }\approx 0.9\pm 0.1$$ α e e * ≈ 0.9 ± 0.1 , highlighting the important role of electron-electron interaction. Our results suggest graphene/h-BN as an ideal platform for investigating strong electron-electron interaction with weak dielectric screening, and lays fundamental physics for gate-tunable nano-electronics and nano-plasmonics.
format	article
author	Hongyun Zhang Shuopei Wang Eryin Wang Xiaobo Lu Qian Li Changhua Bao Ke Deng Haoxiong Zhang Wei Yao Guorui Chen Alexei V. Fedorov Jonathan D. Denlinger Kenji Watanabe Takashi Taniguchi Guangyu Zhang Shuyun Zhou
author_facet	Hongyun Zhang Shuopei Wang Eryin Wang Xiaobo Lu Qian Li Changhua Bao Ke Deng Haoxiong Zhang Wei Yao Guorui Chen Alexei V. Fedorov Jonathan D. Denlinger Kenji Watanabe Takashi Taniguchi Guangyu Zhang Shuyun Zhou
author_sort	Hongyun Zhang
title	Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure
title_short	Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure
title_full	Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure
title_fullStr	Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure
title_full_unstemmed	Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure
title_sort	experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-bn heterostructure
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/cebe098d57f84c03b2c3b710f956c57e
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Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure

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