Evolution of the electronic band structure of twisted bilayer graphene upon doping

Abstract The electronic band structure of twisted bilayer graphene develops van Hove singularities whose energy depends on the twist angle between the two layers. Using Raman spectroscopy, we monitor the evolution of the electronic band structure upon doping using the G peak area which is enhanced w...

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Autores principales:	Shengqiang Huang, Matthew Yankowitz, Kanokporn Chattrakun, Arvinder Sandhu, Brian J. LeRoy
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c90559c9f6f3462ab60206ae436f8061
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id	oai:doaj.org-article:c90559c9f6f3462ab60206ae436f8061
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spelling	oai:doaj.org-article:c90559c9f6f3462ab60206ae436f80612021-12-02T11:52:40ZEvolution of the electronic band structure of twisted bilayer graphene upon doping10.1038/s41598-017-07580-32045-2322https://doaj.org/article/c90559c9f6f3462ab60206ae436f80612017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07580-3https://doaj.org/toc/2045-2322Abstract The electronic band structure of twisted bilayer graphene develops van Hove singularities whose energy depends on the twist angle between the two layers. Using Raman spectroscopy, we monitor the evolution of the electronic band structure upon doping using the G peak area which is enhanced when the laser photon energy is resonant with the energy separation of the van Hove singularities. Upon charge doping, the Raman G peak area initially increases for twist angles larger than a critical angle and decreases for smaller angles. To explain this behavior with twist angle, the energy separation of the van Hove singularities must decrease with increasing charge density demonstrating the ability to modify the electronic and optical properties of twisted bilayer graphene with doping.Shengqiang HuangMatthew YankowitzKanokporn ChattrakunArvinder SandhuBrian J. LeRoyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shengqiang Huang Matthew Yankowitz Kanokporn Chattrakun Arvinder Sandhu Brian J. LeRoy Evolution of the electronic band structure of twisted bilayer graphene upon doping
description	Abstract The electronic band structure of twisted bilayer graphene develops van Hove singularities whose energy depends on the twist angle between the two layers. Using Raman spectroscopy, we monitor the evolution of the electronic band structure upon doping using the G peak area which is enhanced when the laser photon energy is resonant with the energy separation of the van Hove singularities. Upon charge doping, the Raman G peak area initially increases for twist angles larger than a critical angle and decreases for smaller angles. To explain this behavior with twist angle, the energy separation of the van Hove singularities must decrease with increasing charge density demonstrating the ability to modify the electronic and optical properties of twisted bilayer graphene with doping.
format	article
author	Shengqiang Huang Matthew Yankowitz Kanokporn Chattrakun Arvinder Sandhu Brian J. LeRoy
author_facet	Shengqiang Huang Matthew Yankowitz Kanokporn Chattrakun Arvinder Sandhu Brian J. LeRoy
author_sort	Shengqiang Huang
title	Evolution of the electronic band structure of twisted bilayer graphene upon doping
title_short	Evolution of the electronic band structure of twisted bilayer graphene upon doping
title_full	Evolution of the electronic band structure of twisted bilayer graphene upon doping
title_fullStr	Evolution of the electronic band structure of twisted bilayer graphene upon doping
title_full_unstemmed	Evolution of the electronic band structure of twisted bilayer graphene upon doping
title_sort	evolution of the electronic band structure of twisted bilayer graphene upon doping
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c90559c9f6f3462ab60206ae436f8061
work_keys_str_mv	AT shengqianghuang evolutionoftheelectronicbandstructureoftwistedbilayergrapheneupondoping AT matthewyankowitz evolutionoftheelectronicbandstructureoftwistedbilayergrapheneupondoping AT kanokpornchattrakun evolutionoftheelectronicbandstructureoftwistedbilayergrapheneupondoping AT arvindersandhu evolutionoftheelectronicbandstructureoftwistedbilayergrapheneupondoping AT brianjleroy evolutionoftheelectronicbandstructureoftwistedbilayergrapheneupondoping
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Evolution of the electronic band structure of twisted bilayer graphene upon doping

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