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The existence and properties of localised electronic states are described in binary (two layers per period) and polytype (multiple layers per period) semiconductor superlattices. Special attention is paid to surface effects, due to the superlattice potential termination by a clad layer, and the resulting Tamm-like surface states localised at the superlattice/clad-layer interface. The effect of the...
The electronic-level structure and local density-of-states (LDOS) distributions are investigated for an infinite GaAs/Al x Ga 1-x As superlattice (SL) with two strongly spatially confined defect layers (the so-called δ-defects). The energy spectrum is determined by using a multi-matching procedure within the envelope-function approximation, while the LDOS is computed via...
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