Abstract
The tight-binding model Hamiltonian originally proposed by Weaire and Thorpe for the diamond structure has been modified to describe the electronic states in helical-chain semiconductors, as trigonal Se and Te. The model, which takes account both of the intrachain and of the interchain bonds, depends on three parameters. These can be fitted in order to reproduce the main physical features of the band structure. As a possible application it is suggested the calculation of the dielectric matrix and of the magnetic susceptibility in these semiconductors.
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