Dynamic Effective Charge of a Finite Linear Chain.
CALIFORNIA UNIV IRVINE DEPT OF PHYSICS
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A formalism for calculating the dynamic effective charge induced on the atoms of a homopolar crystal by the presence of a surface is presented in the framework of the tight binding approximation. The method is applied to a one dimensional chain of two-electron atoms for the purposes of illustration and identification of the critical model parameters. The wave function of the chain is constructed from a linear combination of s-like and p-like atomic orbitals. It was found that the important model parameters are the energy band gap and the hopping integral between s and p states centered on adjacent sites. The dependence of the dynamic effective charge on these two parameters is presented. Author
- Atomic and Molecular Physics and Spectroscopy
- Solid State Physics