An optical band gap is usually a direct band gap (You can't change the
momentum of the electron by photons, only if they are coupled to phonons
too).
The "experimental" gap can be both, the fundamental (maybe indirect) or
the optical gap, this depends if the "experimental gap" was measured
optically or by photoemission/inverse PE.
On 01/29/2015 02:11 PM, Dr. K. C. Bhamu wrote:
Dear Wien2k User
I am still waiting for my question.
The question is that "If a compound shows two band gaps, direct and
indirect then which one should be compared with optical/experimental
band gap?"
regards
*Bhamu*
**
On Fri, Jan 9, 2015 at 10:56 AM, Dr. K. C. Bhamu <kcbham...@gmail.com
<mailto:kcbham...@gmail.com>> wrote:
Dear Wien2k Users
Optical band gap of a ternary compound is 3.5eV and by theoretical
calculations its showing two band gaps direct and indirect around
2.1 and 3.2 eV, respectively.
Which band gap I should use to compare with optical value?
regards
Bhamu
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