<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>
>sanjeev0302@rediffmail.com> 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>
>> >sanjeev0302@rediffmail.com> 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: sanjeev0302@rediffmail.com<BR>
>> >> sanjeev0302@yahoo.co.in<BR>
>> >> skgupta-phy@msubaroda.ac.in<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>
>>http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3<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: sanjeev0302@rediffmail.com<BR>
>> sanjeev0302@yahoo.co.in<BR>
>> skgupta-phy@msubaroda.ac.in<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>
>><http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3><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: sanjeev0302@rediffmail.com
<br>
sanjeev0302@yahoo.co.in
<br>
skgupta-phy@msubaroda.ac.in
<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 href="http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3"><IMG SRC="http://adworks.rediff.com/cgi-bin/AdWorks/sigimpress.cgi/www.rediff.com/signature-home.htm/1963059423@Middle5?OAS_query=null&PARTNER=3" BORDER=0 VSPACE=0 HSPACE=0></a>