<div>Dear Sanjeev<br>I haven't done the elastic constant until yet so i don't have any idea about it.</div>
<div>i think the best way is looking to the examples.</div>
<div>in the example you can see where you should select automatic k point or manual.</div>
<div>best the wishes </div>
<div>amin<br><br> </div>
<div><span class="gmail_quote">On 12 Dec 2006 09:31:50 -0000, <b class="gmail_sendername">Sanjeev Kumar Gupta</b> <<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@rediffmail.com" target="_blank">
sanjeev0302@rediffmail.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<p> <br>Thanking You Amin,<br><br>I am step_4 , want to calculate elastic constant and electronic DOS?<br>At this step, is any specific k-points or same as we have taken in scf and nscf.<br><br><br>one another confusion, is that , it is neccessary k-points same in scf,nscf,bands,phX, phG,phL? how we will choose k-points for these diiferent calculation?
<br><br>s.k.gupta<br><br><br>On Mon, 11 Dec 2006 Amin Babazadeh wrote :<br>>Hi Sanjeev<br>>For band calculation you should first find the symmetry point of you cell<br>>and then make a k point.because when you plot the band structure it means
<br>>that you like to know about variation of energy in e spatial direction so<br>>this direction is arbitrary(the best direction is the direction of symmetry<br>>point).you can also use Xcrysdan for this job or use the examples k-point
<br>>(esample01)<br>>about the Fermi energy emine said your answer.we use Fermi energy to set a<br>>beginning point for plotting dos or band structure.<br>>best the regards<br>>amin<br>><br>>On 10 Dec 2006 16:20:15 -0000, Sanjeev Kumar Gupta <
<br>><a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@rediffmail.com" target="_blank">sanjeev0302@rediffmail.com</a>> wrote:<br>>><br>>>Thanking you Amin,<br>>><br>
>> >>This is done in espresso code automatically for scf and nscf but for<br>>>plotting band structure you should do it manually>><br>>><br>>>But what will be the maximum and minimum range of the k-point for band
<br>>>calculation and also you said in earlier suggestion that, for scf and nscf<br>>>it is automatic,but we want to do manually the how we will proceeds?<br>>><br>>> >>I thought it is possible.negative
or positive Fermi energy doesn't have<br>>>physical meaning>><br>>><br>>>sorry, for again same question, what is significance of negative fermi<br>>>energy is any relation in other calculation.
<br>>><br>>>I want to find out the elastic constant for my system, how we will<br>>>proceeds?<br>>><br>>><br>>>Regards<br>>>sanjeev<br>>><br>>><br>>>On Sun, 10 Dec 2006 Amin Babazadeh wrote :
<br>>> >Dear sanjeev<br>>> ><br>>> ><br>>> ><br>>> >On 9 Dec 2006 04:44:31 -0000, Sanjeev Kumar Gupta <<br>>> ><a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@rediffmail.com" target="_blank">
sanjeev0302@rediffmail.com</a>> wrote:<br>>> >><br>>> >>Respected sir,<br>>> >><br>>> >>i am sanjeev gupta, from india, working DFT calculation via<br>>> >>Quantum-Espresso-3.1.1
. I have doubts with k-ponits,<br>>> >>1)How we choose k-points for diiferent system?<br>>> >><br>>> ><br>>> >dis is done in espresso code automatically for scf and nscf but for<br>
>>plotting<br>>> >band structure you should do it manually<br>>> ><br>>> >2)Is possible fermi energy negative for noble nitrides?<br>>> >><br>>> >.<br>>> ><br>
>> ><br>>> >3)Is neccessary same k-points for scf and nscf cycle or phX,phL and phG.?<br>>> >>no you can change it.for scf and nscf.usually the kpoint for scf<br>>> >>calculation is smaller than
nscf.about phX,phL and phG i don't have any<br>>> >>idea.<br>>> >><br>>> ><br>>> >good luck<br>>> >amin<br>>> ><br>>> >with regards<br>>> >>sanjeev gupta
<br>>> >><br>>> >>====================================================<br>>> >>Sanjeev Kumar Gupta<br>>> >>Junior Research Fellow (DAE-BRNS)<br>>> >>Computational Condensed Matter Physics Lab.(CCMP)
<br>>> >>Department of Physics, Faculty of Science,<br>>> >>The M.S.University of Baroda, Vadodara - 390 002.<br>>> >>Ph.No: +91-265-279 5339 (O) extn: 30-25<br>>> >>mobile:09374616019
<br>>> >>Email: <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@rediffmail.com" target="_blank">sanjeev0302@rediffmail.com</a><br>>> >> <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@yahoo.co.in" target="_blank">
sanjeev0302@yahoo.co.in</a><br>>> >> <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:skgupta-phy@msubaroda.ac.in" target="_blank">skgupta-phy@msubaroda.ac.in</a><br>>> >>====================================================
<br>>> >><br>>> >>Residential Address-<br>>> >><br>>> >>Dr. Vikram Sarabhai Hall,<br>>> >>Room No.-95, Boys' Hostel,M.S.University Campus,<br>>> >>Pratapgunj,Vadodara-390 002,Gujarat,INDIA
<br>>> >><br>>> >><br>>> >><br>>> >><<br>>><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3" target="_blank">
http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3 </a><br>>> ><br>>> ><br>>> ><br>>> ><br>>> ><br>>> >-- AMIN
<br>>>====================================================<br>>>Sanjeev Kumar Gupta<br>>>Junior Research Fellow (DAE-BRNS)<br>>>Computational Condensed Matter Physics Lab.(CCMP)<br>>>Department of Physics, Faculty of Science,
<br>>>The M.S.University of Baroda, Vadodara - 390 002.<br>>>Ph.No: +91-265-279 5339 (O) extn: 30-25<br>>>mobile:09374616019<br>>>Email: <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@rediffmail.com" target="_blank">
sanjeev0302@rediffmail.com</a><br>>> <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@yahoo.co.in" target="_blank">sanjeev0302@yahoo.co.in</a><br>>> <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:skgupta-phy@msubaroda.ac.in" target="_blank">
skgupta-phy@msubaroda.ac.in</a><br>>>====================================================<br>>><br>>>Residential Address-<br>>><br>>>Dr. Vikram Sarabhai Hall,<br>>>Room No.-95, Boys' Hostel,
M.S.University Campus,<br>>>Pratapgunj,Vadodara-390 002,Gujarat,INDIA<br>>><br>>><br>>><br>>><<a onclick="return top.js.OpenExtLink(window,event,this)" href="http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3" target="_blank">
http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3 </a>><br>><br>><br>><br>><br>>-- AMIN<br></p>====================================================
<br>Sanjeev Kumar Gupta <br>Junior Research Fellow (DAE-BRNS) <br>Computational Condensed Matter Physics Lab.(CCMP) <br>Department of Physics, Faculty of Science, <br>The M.S.University of Baroda, Vadodara - 390 002. <br>
Ph.No: +91-265-279 5339 (O) extn: 30-25 <br>mobile:09374616019 <br>Email: <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@rediffmail.com" target="_blank">sanjeev0302@rediffmail.com</a>
<br> <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:sanjeev0302@yahoo.co.in" target="_blank">sanjeev0302@yahoo.co.in</a> <br> <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:skgupta-phy@msubaroda.ac.in" target="_blank">
skgupta-phy@msubaroda.ac.in</a> <br>==================================================== <br><br>Residential Address- <br><br>Dr. Vikram Sarabhai Hall, <br>Room No.-95, Boys' Hostel,M.S.University Campus, <br>Pratapgunj,Vadodara-390 002,Gujarat,INDIA
<br><br><br><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3" target="_blank"><img hspace="0" border="0">
</a></blockquote></div><br><br clear="all"><br>-- <br>AMIN