<div dir="ltr"><div>Thanks a lot Prof. Blaha. Some of my concerns were addressed by your response. <br></div><div><br></div><div>I still need guidance on the following:</div><div> Recall that the material is a half-metal which is metallic in the dn-spin channel and semiconducting in the up-spin channel.</div><div><br></div><div>When switch 6 is used for the metallic down-spin channel, where is the x joint -dn output written? Is this output the intraband contribution?</div><div><br></div><div>When switch 4 is subsequently used for the down-spin metallic channel, and x joint -dn is executed, where is the output stored or does it overwrite the previous result.?</div><div><br></div><div>Switch 6 will not be used for the semiconducting up-spin channel, hence the plasma frequency(omega_pl(up-spin) will be zero. I do not know if this is correct.</div><div>The expression for the plasma frequency will have only down-spin contribution.</div><div><br></div><div>Sincere regards.</div><div><br></div><div>Chukwuemeka Okoye<br></div><div><br></div><div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><div><div><i>------------------------------<br>Chukwuemeka M I <b>Okoye</b><br></i></div><i>Department of Physics and Astronomy,<br></i></div><i>University of Nigeria, <br></i></div><i>Nsukka, Enugu State,<br></i></div><i>Nigeria</i><br><div>Telephone: +234 7038766990<br></div><div>E-mail: <a href="mailto:cmi.okoye@unn.edu.ng" target="_blank">cmi.okoye@unn.edu.ng</a><br></div></div></div></div></div></div></div></div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 27, 2022 at 2:42 PM Peter Blaha <<a href="mailto:peter.blaha@tuwien.ac.at">peter.blaha@tuwien.ac.at</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">> Dear all,<br>
> I will appreciate some clarifications on the calculation of optical <br>
> properties of half metal in which the majority (spin up) channel is <br>
> semiconducting and metallic in the spin down channel. After calculating <br>
> optic -up(-dn) the following steps were followed. (i) For spin down <br>
> (metallic) channel: Calculate joint -dn (with switch 6); <br>
<br>
Before the next step, look into the case.outputjointup file and write <br>
down the plasma frequency. It gets overwritten by switch 4.<br>
<br>
Calculate joint<br>
> -dn (with switch 4)<br>
> *_Question_*:How can the intraband and interband contributions be <br>
> extracted separately for this metallic spin down channel?<br>
> (ii) For the semiconducting spin up channel, switch 4 was used to <br>
> calculate joint -up.<br>
> _*Question*_: Where are the interband contributions written or does the <br>
> new outcome overwrite the earlier one?<br>
> (iii) joint-updn_lapw<br>
> _*Question*_: Is it necessary to use switch 6 in inkram, since we have <br>
> both semiconducting and metallic channels mixed in (iii) above? If 1 is <br>
> used in line 3 of inkram, shall we regard the outcome of x kram as <br>
> 'sum' of both intraband and interband transitions?<br>
<br>
What is "switch 6" in inkram ???<br>
Use 1 in the 3rd line and the result is the sum of up+dn when you <br>
provide the proper plama frequency (please checkout the comments how one <br>
calculates the plasmafrequency in spin-pol. calc in the UG (sec. kram).<br>
<br>
> <br>
> Thanks for your kind assistance.<br>
> <br>
> Chukwuemeka Okoye<br>
> /------------------------------<br>
> Chukwuemeka M I *Okoye*<br>
> /<br>
> /Department of Physics and Astronomy,<br>
> /<br>
> /University of Nigeria,<br>
> /<br>
> /Nsukka, Enugu State,<br>
> /<br>
> /Nigeria/<br>
> Telephone: +234 7038766990<br>
> E-mail: <a href="mailto:cmi.okoye@unn.edu.ng" target="_blank">cmi.okoye@unn.edu.ng</a> <mailto:<a href="mailto:cmi.okoye@unn.edu.ng" target="_blank">cmi.okoye@unn.edu.ng</a>><br>
> <br>
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