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

• Ano de defesa: 2004
• Autor(a) principal: Abreu, Eduardo de Paula
• Orientador(a): Emmel, Paulo Daniel
• 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
• País: BR
• Palavras-chave em Português: Matéria condensada (propriedade ótica); Método de Monte Carlo; Simulação; Coeficiente de absorção ótica; Ponto quântico
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://repositorio.ufscar.br/handle/20.500.14289/4933

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.