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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">How do you think, direct energy band gap or indirect energy band gap? I think you have your answer already. Transitions in Indirect band gap require phonon
while direct band gap doesn’t. <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> wien-bounces@zeus.theochem.tuwien.ac.at [mailto:wien-bounces@zeus.theochem.tuwien.ac.at]
<b>On Behalf Of </b>Dr. K. C. Bhamu<br>
<b>Sent:</b> Thursday, 29 January, 2015 9:11 PM<br>
<b>To:</b> A Mailing list for WIEN2k users<br>
<b>Subject:</b> Re: [Wien] (no subject)<o:p></o:p></span></p>
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<p class="MsoNormal">Dear Wien2k User <o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I am still waiting for my question.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">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?"<o:p></o:p></p>
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<p class="MsoNormal">regards<o:p></o:p></p>
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<p class="MsoNormal"><b>Bhamu</b><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Jan 9, 2015 at 10:56 AM, Dr. K. C. Bhamu <<a href="mailto:kcbhamu85@gmail.com" target="_blank">kcbhamu85@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Dear Wien2k Users<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">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.<o:p></o:p></p>
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<p class="MsoNormal">Which band gap I should use to compare with optical value?<br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">regards<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#888888">Bhamu<o:p></o:p></span></p>
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