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Master's Dissertation
DOI
10.11606/D.54.1990.tde-10032015-172847
Document
Author
Full name
Roberto Ricardo Panepucci
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1990
Supervisor
Committee
Hipolito, Oscar (President)
Ioriatti Júnior, Lidério Citrângulo
Studart Filho, Nelson
Title in Portuguese
Excitons em estruturas semicondutoras quasi-unidimensionais
Keywords in Portuguese
Não disponível
Abstract in Portuguese
Neste trabalho estudamos o comportamento da energia de ligação de um éxciton em um fio quântico. O modelo utilizado considera barreiras finitas e seção transversal retangular. Utilizamos o método variacional com uma função de onda tentativa na forma gaussiana. Os parâmetros do material utilizados no calculo são os do GaAs/Ga1-xAlxAs. Incluímos a anisotropia das massas dos buracos leve e pesado, que e gerada pelo confinamento na direção y, desprezando outros efeitos na estrutura de banda. Comparamos nossos resultados com cálculos teóricos existentes. Estudamos também o efeito da interação com fônons sobre a energia de ligação do éxciton no fio quântico. Para tanto utilizamos um método variacional conjugado com transformações unitárias proposto por Lee-Low-Pines
Title in English
Not available
Keywords in English
Not available
Abstract in English
In this work we study the behavior of the exciton binding energy in a quantum wire. The model assumes finite barrier height and a rectangular cross section. A variation method is used with a Gaussian trial wave function. The material parameters used in the calculations are those of the GaAs/Ga1-xAlxAs. The heavy and light hole mass anisotropies arising from confinement in the wire direction is included, while other effects in the band structure are neglected. The present results are compared with other authors calculations. The effect of the fonon interaction on the exciton binding energy in the quantum wire is analyzed. For this purpose a variation method conjugated with unitary transformations as proposed by Lee-Low-Pines was employed
 
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Publishing Date
2015-03-12
 
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