Impurity binding energies in semiconductor Fibonacci superlattices
We have calculated the density of states (DOS) of a GaAsGaAl superlattice whose ratio between the potential energy of the impurities and the potential energy of the atoms at the lattice is a nth power of the golden mean (n=1,2,3,). Our theory uses Dyson's equation together with a transfer-matrix treatment, within the tight-binding Hamiltonian model. The electronic DOS is calculated stressing the regions of frequency where the transfer function is complex, which correspond to non-localized states.
impurities fibonacci superlattices electron density of status