Dispersion Energy in Semi Conductors: What Is It?

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can anyone tell me what is the dispersion energy in semi conductors
 
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I don't recall ever hearing the expression "dispersion energy" but here are some suggestions:

1) Could it be energy dispersion. This would be a plot of E vs. k otherwise known as the band structure.
2) Could it be the diffusion energy? This is a parameter which appears in the Drude theory of metals and is used to model the dielectric function of semiconductors in the Drude-Lorentz model.
 
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