Efeitos da interação de plasma na absorção ótica em super-rede randômica de pontos quânticos.

Detalhes bibliográficos
Ano de defesa: 2004
Autor(a) principal: Abreu, Eduardo de Paula
Orientador(a): Emmel, Paulo Daniel lattes
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de São Carlos
Programa de Pós-Graduação: Programa de Pós-Graduação em Física - PPGF
Departamento: Não Informado pela instituição
País: BR
Palavras-chave em Português:
Área do conhecimento CNPq:
Link de acesso: https://repositorio.ufscar.br/handle/20.500.14289/4933
Resumo: In this work the ground and first excited states of the electron are calculated in interacting one-dimensional, two-dimensional lattices and multilayers of cylindrical quantum dots containing at the most an electron and considering both infinite and finite potential barriers. The dimensions and the occupation of the quantum dots are chosen randomly using Monte Carlo s method. In the case of finite barrier we calculated the levels of energy through the Density Functional Theory (DFT ). We calculated the envelope function considering the effective mass approximation and using the numeric method developed by Samita Gangopadhyay and B.R. Nag. Once obtained the levels of energy, we calculated the absorption coefficient considering the electron-electron interaction. The calculations show the influence of the plasma interaction in the absorption. The results demonstrate a change of the absorption coefficient as a function of the density of quantum dots. When the electric field is applied the absorption peak moves to the right indicating a collective response of interacting localized electrons.