[Wien] scan xc functional

tran at theochem.tuwien.ac.at tran at theochem.tuwien.ac.at
Fri Jun 29 20:43:52 CEST 2018


For GaP with these RMTs, an increase of GMAX or IFFT has no effect.


On Friday 2018-06-29 18:25, Laurence Marks wrote:

>Date: Fri, 29 Jun 2018 18:25:45
>From: Laurence Marks <L-marks at northwestern.edu>
>Reply-To: A Mailing list for WIEN2k users <wien at zeus.theochem.tuwien.ac.at>
>To: A Mailing list for WIEN2k users <wien at zeus.theochem.tuwien.ac.at>
>Subject: Re: [Wien] scan xc functional
>
>Did you (plural) use a large GMAX? From what I have seen GMAX=12 is not good enough for metaGGAs, and a larger value of 16-24 is better.
>
>On Fri, Jun 29, 2018 at 11:05 AM, tran at theochem.tuwien.ac.at <tran at theochem.tuwien.ac.at> wrote:
>      I could reproduce your SCAN results with the first set of RMTs,
>      but I don't know if such problem is specific to SCAN or MGGAs
>      in general. With GGA-PBE it is perfectly converged with RKmax=8 already.
>
>      If you need to converge the third digit after decimal point for the
>      lattice constant, then increase also lvnsmax to 6 in case.in1c.
>
>      If you are interested in the band gap, then be aware that MGGAs
>      like SCAN are not implemented self-consistently. By default, the
>      potential (and thus the band gap) is PBE.
>
>      FT
>
>      On Friday 2018-06-29 16:06, sandeep arora wrote:
>
>      >Date: Fri, 29 Jun 2018 16:06:20
>      >From: sandeep arora <sndp.arora at rediffmail.com>
>      >Reply-To: A Mailing list for WIEN2k users <wien at zeus.theochem.tuwien.ac.at>
>      >To: wien at zeus.theochem.tuwien.ac.at
>      >Subject: Re: [Wien] scan xc functional
>      >
>      >Yes i have checked convergence w.r.t. rkmax and kmesh. The new sphere radii
>      >are Ga 2.11 and 2.09.
>      >
>      >sandeep
>      >
>      >
>      >From: tran at theochem.tuwien.ac.at
>      >Sent:Fri, 29 Jun 2018 18:43:37 +0530
>      >To: A Mailing list for WIEN2k users wien at zeus.theochem.tuwien.ac.at
>      >Subject: Re: [Wien] scan xc functional
>      >What new sphere radii have you used? Have you observed convergence
>      >
>      >> with respect to RKmax?
>      >
>      >>
>      >
>      >> On Friday 2018-06-29 15:09, sandeep arora wrote:
>      >
>      >>
>      >
>      >> >Date: Fri, 29 Jun 2018 15:09:59
>      >
>      >> >From: sandeep arora <sndp.arora at rediffmail.com>
>      >
>      >> >Reply-To: A Mailing list for WIEN2k users
>      ><wien at zeus.theochem.tuwien.ac.at>
>      >
>      >> >To: wien at zeus.theochem.tuwien.ac.at
>      >
>      >> >Subject: Re: [Wien] scan xc functional
>      >
>      >> >
>      >
>      >> >Prof Victor and Tran
>      >
>      >> >
>      >
>      >> >Thanks for your valuable suggestions.i got the solution, with a proper
>      >
>      >> >sphere radii.
>      >
>      >> >
>      >
>      >> >Sandeep
>      >
>      >> >
>      >
>      >> >
>      >
>      >> >From: tran at theochem.tuwien.ac.at
>      >
>      >> >Sent:Fri, 29 Jun 2018 12:37:53 +0530
>      >
>      >> >To: A Mailing list for WIEN2k users wien at zeus.theochem.tuwien.ac.at
>      >
>      >> >Subject: Re: [Wien] scan xc functional
>      >
>      >> >Hi,
>      >
>      >> >
>      >
>      >> >>
>      >
>      >> >
>      >
>      >> >> what is the radius of the Ga and P spheres?
>      >
>      >> >
>      >
>      >> >>
>      >
>      >> >
>      >
>      >> >> FT
>      >
>      >> >
>      >
>      >> >>
>      >
>      >> >
>      >
>      >> >> On Friday 2018-06-29 08:44, sandeep arora wrote:
>      >
>      >> >
>      >
>      >> >>
>      >
>      >> >
>      >
>      >> >> >Date: Fri, 29 Jun 2018 08:44:48
>      >
>      >> >
>      >
>      >> >> >From: sandeep arora <sndp.arora at rediffmail.com>
>      >
>      >> >
>      >
>      >> >> >Reply-To: A Mailing list for WIEN2k users
>      >
>      >> ><wien at zeus.theochem.tuwien.ac.at>
>      >
>      >> >
>      >
>      >> >> >To: wien at zeus.theochem.tuwien.ac.at
>      >
>      >> >
>      >
>      >> >> >Subject: [Wien] scan xc functional
>      >
>      >> >
>      >
>      >> >> >
>      >
>      >> >
>      >
>      >> >> >Dear wien2k users
>      >
>      >> >
>      >
>      >> >> >I want to use scan exchange correlation for optimization of binary
>      >
>      >> >
>      >
>      >> >> >semiconductors(GaP).But the lattice constant varies with Rkmax at
>      >third
>      >
>      >> >
>      >
>      >> >> >decimal place even on increasing rkmax up to 11 and increasing ifft
>      >
>      >> >
>      >
>      >> >> >enhancement factor up to 4 in case.in0.although the E-V graph is
>      >smooth.
>      >
>      >> >
>      >
>      >> >> >Please suggest some solution to converge the lattice constant with
>      >rkmax.
>      >
>      >> >
>      >
>      >> >> >the results obtained are
>      >
>      >> >
>      >
>      >> >> >RK
>      >
>      >> >
>      >
>      >> >> >8.0 5.4663
>      >
>      >> >
>      >
>      >> >> >8.5 5.4651
>      >
>      >> >
>      >
>      >> >> >9.5 5.4642
>      >
>      >> >
>      >
>      >> >> >10.0 5.4633
>      >
>      >> >
>      >
>      >> >> >
>      >
>      >> >
>      >
>      >> >> >Thanks
>      >
>      >> >
>      >
>      >> >> >Sandeep
>      >
>      >> >
>      >
>      >> >> >
>      >
>      >> >
>      >
>      >> >> >
>      >
>      >> >
>      >
>      >> >> _______________________________________________
>      >
>      >> >
>      >
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>      >> >
>      >
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>      >
>      >> >
>      >
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>      >
>      >> >
>      >
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>      >
>      >> >
>      >
>      >> >>
>      >
>      >> >
>      >
>      >> >
>      >
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>
>--
>Professor Laurence Marks
>"Research is to see what everybody else has seen, and to think what nobody else has thought", Albert Szent-Gyorgi
>www.numis.northwestern.edu ; Corrosion in 4D: MURI4D.numis.northwestern.eduPartner of the CFW 100% program for gender equity, www.cfw.org/100-percent
>Co-Editor, Acta Cryst A
>
>


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