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Evolution of the electronic band structure of twisted bilayer graphene upon doping
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 l...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5548766/ https://www.ncbi.nlm.nih.gov/pubmed/28790318 http://dx.doi.org/10.1038/s41598-017-07580-3 |
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author | Huang, Shengqiang Yankowitz, Matthew Chattrakun, Kanokporn Sandhu, Arvinder LeRoy, Brian J. |
author_facet | Huang, Shengqiang Yankowitz, Matthew Chattrakun, Kanokporn Sandhu, Arvinder LeRoy, Brian J. |
author_sort | Huang, Shengqiang |
collection | PubMed |
description | 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 | Online Article Text |
id | pubmed-5548766 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-55487662017-08-09 Evolution of the electronic band structure of twisted bilayer graphene upon doping Huang, Shengqiang Yankowitz, Matthew Chattrakun, Kanokporn Sandhu, Arvinder LeRoy, Brian J. Sci Rep Article 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. Nature Publishing Group UK 2017-08-08 /pmc/articles/PMC5548766/ /pubmed/28790318 http://dx.doi.org/10.1038/s41598-017-07580-3 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Huang, Shengqiang Yankowitz, Matthew Chattrakun, Kanokporn Sandhu, Arvinder LeRoy, Brian J. Evolution of the electronic band structure of twisted bilayer graphene upon doping |
title | 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_short | 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 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5548766/ https://www.ncbi.nlm.nih.gov/pubmed/28790318 http://dx.doi.org/10.1038/s41598-017-07580-3 |
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