If you have a metal, i.e. some bands cross EF, you should have a
finite (maybe small) plasma frequency (like in transparent conducting
oxides)
Am 13.07.2013 18:37, schrieb venkatesh chandragiri:
Dear sir,
*I thought your material has a gap, and the question was only direct or
indirect ..
I thought your material has a gap, and the question was only direct or
indirect .. ??
Of course, a supercell MUST not change the optical property. The
momentum matrix elements should take care that there is no transition
from Gamma - backfolded-X point.
Am 12.07.2013 22:25, schrieb
Dear sir,
*I thought your material has a gap, and the question was only direct
or indirect
.. ??*
If i did the calculations using the structure stimulated from the space
group (225), it shows a negative indirect band gap in the band structure
(negative indirect band gap means, the valance band
Dear sir,
I have measured the optical properties of Fe2VAl material by creating a
primitive like lattice which contains 16 atoms. Being a semi-metal like
nature, Fe2VAl shows typical pseudo-gap like behaviour in DOS spectrum.
However, i have seen that a few orbitals are crossing each other at
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