Thank you very much Prof Blaha and Prof Khuong. regards Bhamu
On Thu, Jan 29, 2015 at 9:56 PM, Peter Blaha <[email protected]> wrote: > 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 <[email protected] >> <mailto:[email protected]>> 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 >> >> _______________________________________________ >> Wien mailing list >> [email protected] <mailto:[email protected]. >> tuwien.ac.at> >> http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien >> SEARCH the MAILING-LIST at: >> http://www.mail-archive.com/[email protected]. >> at/index.html >> >> >> >> >> _______________________________________________ >> Wien mailing list >> [email protected] >> http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien >> SEARCH the MAILING-LIST at: http://www.mail-archive.com/ >> [email protected]/index.html >> >> > -- > > P.Blaha > -------------------------------------------------------------------------- > Peter BLAHA, Inst.f. Materials Chemistry, TU Vienna, A-1060 Vienna > Phone: +43-1-58801-165300 FAX: +43-1-58801-165982 > Email: [email protected] WIEN2k: http://www.wien2k.at > WWW: http://www.imc.tuwien.ac.at/staff/tc_group_e.php > -------------------------------------------------------------------------- > _______________________________________________ > Wien mailing list > [email protected] > http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien > SEARCH the MAILING-LIST at: http://www.mail-archive.com/ > [email protected]/index.html >
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