Abstract
In this paper we discuss the importance of separating the susceptibility tensor in the isotropic and anisotropic parts, we show how to do that and what is the contribution from each part to the nonlinear polarizability. Specific examples are given for second harmonic generation in the surface of Si(001) and for third harmonic generation in bulk silicon along (001) direction. Our calculations are performed using simplified bond-hyperpolarizability model.
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