Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/47442
Título: | Excitonic effects in the optical properties of 2D materials: An equation of motion approach |
Autor(es): | Chaves, A. J. Ribeiro, R. M. Frederico, T. Peres, N. M. R. |
Palavras-chave: | Excitons TMD Bethe-Salpeter Dirac 2D materials transition metal dichalcogenides |
Data: | 4-Abr-2017 |
Editora: | IOP Publishing |
Revista: | 2D Materials |
Resumo(s): | We present a unified description of the excitonic properties of four monolayer transition-metal dichalcogenides (TMDC's) using an equation of motion method for deriving the Bethe-Salpeter equation in momentum space. Our method is able to cope with both continuous and tight-binding Hamiltonians, and is less computational demanding than the traditional first-principles approach. We show that the role of the exchange energy is essential to obtain a good description of the binding energy of the excitons. The exchange energy at the $\Gamma-$point is also essential to obtain the correct position of the C-exciton peak. Using our model we obtain a good agreement between the Rydberg series measured for WS$_2$. We discuss how the absorption and the Rydberg series depend on the doping. Choosing $r_0$ and the doping we obtain a good qualitative agreement between the experimental absorption and our calculations for WS$_2$. We also derive a semi-analytical version of Ellitot's formula for TMDC's. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/47442 |
DOI: | 10.1088/2053-1583/aa6b72 |
ISSN: | 2053-1583 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - CEP - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1704.00975.pdf | 1,64 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons