THE DETERMINATION OF THE MOMENTUM MATRIX-ELEMENTS INVOLVED IN CALCULATING THE DIELECTRIC-CONSTANTS OF SUPERLATTICES USING THE TIGHT-BINDING METHOD

Using the Wigner-Eckart theorem we have deduced formulae for momentum matrix elements in the tight-binding approach in terms of some parameters. For III-V compound semiconductors some explicit expressions have been obtained with four parameters. These parameters can be determined by comparing the calculated values of electrical or optical constants with their corresponding experimental values. The formulae have been applied to calculation of the imaginary part of the dielectric constant for a monolayer superlattice Ga0.47In0.53As/InP (1 1 0). © 1990.