Localized electronic states in -layer-based superlattices with structural defects

We present a finite-difference scheme for computing the Green's function of a one-dimensional crystal. The method enables one to derive the band structure and the density of states of this type of structures, whatever the particular values of the potential energy. The technique also enables one to compute the influence of defects on the density of states and on the scattering of the eigenstates of the crystal. The technique is applied to the Krönig-Penney potential. In particular, we study the bound states of a square potential introduced in the crystal and their influence on the conductance of the system. We also determine the surface states induced by a termination of the Krönig-Penney potential. Our results turn out to be in excellent agreement with analytical expressions, which proves their validity and the versatility of the technique.

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Modification of Optical Transition Probability in Semiconductor Superlattices: Effects of Structural Defect and Layer Thickness

Liu

Wang

Fang

et al. 2011

Int. J. Mod. Phys. B

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We present the modification of optical transition probability in the superlattices (SLs) due to the presence of structural defect and the variation of layer thickness. The results show that optical transition probability between two bound states is mainly determined by the thicknesses of layer in defect region and its nearest constituent layers for a symmetric structure. When the well layer thickness varies, the variation of transition probabilities between two bound states depend on the parity of the index of minigap n, while those from the bound states to the delocalized scattering is irrelevant to n. It is believed that applying appropriate structure and layer thickness may enhance the optical transition probability in designing optical device.

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Localized electronic states in -layer-based superlattices with structural defects

Cited by 3 publications

References 32 publications

The evolution of the localized plasmon modes in a semi-infinite superlattice with cap layer

The evolution of the localized plasmon modes in a semi-infinite superlattice with cap layer

Finite-difference calculation of the Green’s function of a one-dimensional crystal: Application to the Krönig-Penney potential

Modification of Optical Transition Probability in Semiconductor Superlattices: Effects of Structural Defect and Layer Thickness

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