[Wannier] The relationship between the optical conductivity tensor and the dielectric tensor

[Wei Xu]

Dear developers and users:
Just a small question.
I know that postw90.x can calculate optical conductivity tensors.
I'm wondering whether the familiar relationship between optical
conductivity tensor and dielectric tensor (which is shown below) still
holds here? Since the dielectric tensor for bulk Si which I obtained from
the calculated optical conductivity in that way shows considerable
off-diagonal elements whereas the macroscopic dielectric matrix for bulk Si
is expected to be diagonal.
[image: Inline image 1]
Of course, an inproper parameter setting could lead to inaccurate results,
but for now what's more bothering me is whether the relationship above is
still true here.

Thank you in advance for any help you could offer :)


Wei Xu

Ph.D. student
Dept. of phys., Fudan University
No.220 Han Dan Rd, Shanghai, 200433, China
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