Programa de Pós-graduação em Física
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Navegando Programa de Pós-graduação em Física por Autor "ALVES, Erivelton de Oliveira"
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Item Éxcitons em semicondutores magnéticos diluídos(Universidade Federal de Goiás, 2006-08-02) ALVES, Erivelton de Oliveira; SOUZA, Márcio Adriano Rodrigues; http://lattes.cnpq.br/2980610890056479We investigate the resonant tunneling of electrons and holes in an asymmetric double quantum bit CdTe / CdMnTe in the presence of electric and magnetic fields applied along the growth direction. We show that in this case it is possible to achieve a condition of simultaneous resonant tunneling of electrons and holes with spin set, ie, a resonant tunneling of excitons polarized. Then we calculated the excitonic binding energy as a function of applied fields, showing the strong dependence of the binding energy with the tunneling of carriers. The electronic structure was calculated using the k ~ ~ p multiband Kane model. The eigenstates were obtained by solving numerically the equations ° C ~ the effective mass using the method of inverse power. The effects of lattice strain were treated by the Bir-Pikus model. The energy calculation of excitonic Dial-Up was conducted using the variational method. We consider the perfectly abrupt interfaces of the heterostructures, ie effects of enlargement of the interfaces were neglected.