Si conductivity depenence on crystal orientation?

DrDu

Yes, but the small k limit is exactly what you are looking at when you consider a Taylor expansion of conductivity.
A similar example are classical sound waves which are just low k phonons.

M Quack

Yes.

So how do you "feed" k into the macroscopic DC conductivity? Or is this a k=0 property and thus isotropic?

My point is that to observe anisotropy you have to measure at a finite value of k.

DrDu

For DC conductivity this is in deed not very interesting. At omega=0 spatial dispersion can be described in terms of magnetic permeability. Longitudinal variations of E will be screened completely, anyhow.
I was refering mainly conductivity in the optical range.

M Quack

OK, glad we agree then.

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DrDu Recognitions: Science Advisor	Si conductivity depenence on crystal orientation? Yes, but the small k limit is exactly what you are looking at when you consider a Taylor expansion of conductivity. A similar example are classical sound waves which are just low k phonons.

M Quack	Yes. So how do you "feed" k into the macroscopic DC conductivity? Or is this a k=0 property and thus isotropic? My point is that to observe anisotropy you have to measure at a finite value of k.