[Wien] Vacuum is not optimized, why?

Saeid Jalali s_jalali_a at yahoo.com
Mon May 21 10:51:38 CEST 2012 

Dear Peter,
Thank you for your reply and comment.
The Rmt*Kmax is 4 in case.inc at the end of the scf's for every vacuum thickness. Is it possible the program reduces the Rmt*Kmax internally so that we cannot be aware of it just by looking at the case.inc after the end of scf's? 

We suspected that the "WARNINGS" originated from the number of k-point--we have used only 1 k-point.
 
We find that the "WRNINGS" disappear, if we increase the number of k-points.
But, we are forced (for some different reasons) to use only 1 k-pint.
 

Sincerely yours,
S. Jalali
/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Saeid Jalali Asadabadi,
Department of Physics, Faculty of Science,
University of Isfahan (UI), Hezar Gerib Avenue,
81744 Isfahan, Iran.
Phones:
Dep. of Phys.   :+98-0311-793 2435
Office               :+98-0311-793 4776
Fax No.            :+98-0311-793 4800
E-mail              :sjalali at phys.ui.ac.ir
                          :sjalali at sci.ui.ac.ir
                          :sjalali at mailaps.org
                          :saeid.jalali.asadabadi at gmail.com
                          :s_jalali_a at yahoo.com
Homepage        :http://sci.ui.ac.ir/~sjalali
www                  :http://www.ui.ac.ir
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________________________________
 From: Peter Blaha <pblaha at theochem.tuwien.ac.at>
To: A Mailing list for WIEN2k users <wien at zeus.theochem.tuwien.ac.at> 
Sent: Monday, May 21, 2012 12:16 PM
Subject: Re: [Wien] Vacuum is not optimized, why?
 
Look at the reasons for the "WARNINGS" !

Maybe the program reduced automatically RKmax as you increase the vacuum because of NMATMAX in your
installation.

Am 21.05.2012 09:30, schrieb Saeid Jalali:
> Dear WIEN2k community,
> We are working on an insulator bio case, ployalanine amino-acid chain, using the latest version of the WIEN2k code, i.e., WIEN2k 11.1, within PBE-GGA. Our structure contains 48
> atoms. The atoms are C, O, N, and H. The lattice type is P with lattice parameters of a=b=13, c=17 angstrom. We have added vacuum along the c-axis, and increase the vacuum from 5
> to 25 angstrom. Therefore, c varies from 17+5=22 to 17+25=42 angstrom. The R_MT radii are between 0.67 to 1.2 bohr. We set G_max=20, and RMT*Kmax=4 based on item number 6 of the
> following link, as indicated in the RMT section of the FAQ:
> http://www.wien2k.at/reg_user/faq/rmt.html
> We have used the "in1new 3" flag instead of in1ef to avoid ghost band error to run_lapw.
> We select the k-point to be 2x2x1 due to our large lattice parameters which is equivalent to 1 k-point.
> We plotted energy versus vacuum thickness. We observed that the total energy increases linearly as the vacuum thickness increases. We expected that the total energy asymptotically
> converged by increasing vacuum thickness to a nearly constant value.
> But, the energy is not converged even when we increase the vacuum to a large value of 25 angstrom (about 50 bohr!).
>
> Any idea is highly appreciated to overcome this problem so that we can reach to a converged value for the vacuum thickness.
>
> For your information the :ENEs are pasted below indicating vacuum thicknesses:
> ...
> -----------Vacuum=18 bohr----------
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.66370331
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.52754252
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.36953415
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.35063519
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.33167823
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32597371
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32132091
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32174685
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32188550
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32197519
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32198821
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32198492
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32198219
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32198131
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.32197955
> -----------Vacuum=20 bohr----------
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.20341913
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1143.06185841
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.97185748
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.91512471
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.89150778
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88552440
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88070270
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88102994
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88122376
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88131918
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88133048
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88133107
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88132951
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88132839
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88132703
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88132653
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.88132652
> -----------Vacuum=22 bohr----------
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.73823447
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.59540722
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.58205832
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.47379361
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.44173301
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43602112
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43035957
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43063581
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43089589
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43097934
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43099282
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43099764
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43099778
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43099678
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.43099579
> -----------Vacuum=24 bohr----------
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.28343926
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.14127406
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.21313913
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1142.04180114
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.99605423
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.99009042
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98464480
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98484180
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98511086
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98520480
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98521697
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98522315
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98522476
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98522430
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.98522338
> ...
> -----------Vacuum=30 bohr----------
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.93575080
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.78988094
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1141.29389165
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.73672649
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.58755964
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.61165126
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60432545
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60055453
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60187927
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60231430
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60316998
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60327053
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60332892
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60334528
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60334602
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60334714
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60334756
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60334818
> :ENE : *WARNING** TOTAL ENERGY IN Ry = -1140.60334830
> ...
> ...
> ...
> Sincerely yours,
> S. Jalali
> /_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> Saeid Jalali Asadabadi,
> Department of Physics, Faculty of Science,
> University of Isfahan (UI), Hezar Gerib Avenue,
> 81744 Isfahan, Iran.
> Phones:
> Dep. of Phys. :+98-0311-793 2435
> Office :+98-0311-793 4776
> Fax No. :+98-0311-793 4800
> E-mail :sjalali at phys.ui.ac.ir <mailto:sjalali at phys.ui.ac.ir>
> :sjalali at sci.ui.ac.ir <mailto:sjalali at sci.ui.ac.ir>
> :sjalali at mailaps.org <mailto:sjalali at mailaps.org>
> :saeid.jalali.asadabadi at gmail.com <mailto:saeid.jalali.asadabadi at gmail.com>
> :s_jalali_a at yahoo.com <mailto:s_jalali_a at yahoo.com>
> Homepage :http://sci.ui.ac.ir/~sjalali <http://sci.ui.ac.ir/%7Esjalali>
> www :http://www.ui.ac.ir <http://www.ui.ac.ir/>
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>
>
>
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                                       P.Blaha
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