<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Hi Nicki,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Thanks for your input! </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br>Regards,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Xufeng</div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 19, 2017 at 6:00 AM, <span dir="ltr"><<a href="mailto:pw_forum-request@pwscf.org" target="_blank">pw_forum-request@pwscf.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Pw_forum mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Re: carrier lifetime, diffusion length, mobility (HASSAN<br>
AHMOUM) (Abdullah N. Albarakati)<br>
2. Re: carrier lifetime, diffusion length, mobility (HASSAN<br>
AHMOUM) (Nicola Marzari)<br>
3. Re: Silicon DOS issue - Pw_forum Digest, Vol 115, Issue 18<br>
(nicvok)<br>
4. Units in Vc-relax (Manu Hegde)<br>
5. Re: Units in Vc-relax (stefano de gironcoli)<br>
6. Re: Units in Vc-relax (Manu Hegde)<br>
7. upcoming workshops, summer schools and how to find them?<br>
(Christoph Wolf (??????))<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>----------<br>
<br>
Message: 1<br>
Date: Sat, 18 Feb 2017 12:22:11 +0000<br>
From: "Abdullah N. Albarakati" <<a href="mailto:anbarakati@uqu.edu.sa">anbarakati@uqu.edu.sa</a>><br>
Subject: Re: [Pw_forum] carrier lifetime, diffusion length, mobility<br>
(HASSAN AHMOUM)<br>
To: PWSCF Forum <<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>>, "<a href="mailto:eariel99@gmail.com">eariel99@gmail.com</a>"<br>
<<a href="mailto:eariel99@gmail.com">eariel99@gmail.com</a>><br>
Message-ID:<br>
<<wbr>5ED2E303D4C23C408E21E279D5D179<wbr>E7CB9DE062@UQUMB01.UQU.LOCAL><br>
Content-Type: text/plain; charset="iso-8859-1"<br>
<br>
Dear Eduardo Menendez,<br>
<br>
Thank you very much,<br>
<br>
so far, I follow your recommendation and I will feedback with my finding,<br>
<br>
Best wishes,<br>
______________________________<wbr>__<br>
From: <a href="mailto:pw_forum-bounces@pwscf.org">pw_forum-bounces@pwscf.org</a> [<a href="mailto:pw_forum-bounces@pwscf.org">pw_forum-bounces@pwscf.org</a>] on behalf of Eduardo Menendez [<a href="mailto:eariel99@gmail.com">eariel99@gmail.com</a>]<br>
Sent: Thursday, February 16, 2017 3:40 PM<br>
To: <a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a><br>
Subject: Re: [Pw_forum] carrier lifetime, diffusion length, mobility (HASSAN AHMOUM)<br>
<br>
Dear all,<br>
The mentioned equations are just for for ZnO, and they use some experimental values of the conductivity. However, the method can be replicated for other II-VI or III-V compounds. I would not dare to replicate it for a different class of material.<br>
<br>
Computing directly the carrier lifetime is mainly a matter of eletron-phonon interactions and electron-defect interaction, and electron-hole recombination. All of them could be done with the help of Quantum ESPRESSO, using auxiliary codes, but I do not know any implementation to do it.<br>
I hope someone hast and cat share it.<br>
<br>
Eduardo Menendez-Proupin<br>
<br>
<br>
---------- Mensaje reenviado ----------<br>
From: HASSAN AHMOUM <<a href="mailto:h.ahmoum@gmail.com">h.ahmoum@gmail.com</a><mailto:<a href="mailto:h.ahmoum@gmail.com">h.<wbr>ahmoum@gmail.com</a>>><br>
To: <a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a><mailto:<a href="mailto:pw_forum@pwscf.org">pw_<wbr>forum@pwscf.org</a>><br>
Cc:<br>
Date: Wed, 15 Feb 2017 16:10:10 +0100<br>
Subject: Re: [Pw_forum] carrier lifetime, diffusion length, mobility<br>
Dear Abdullah<br>
<br>
Yes you can calculate indirectly all this parameter's by using Boltztrap code.<br>
<br>
Boltztrap give you as output file ( carrier concentration, conductivity/carrier lifetime)<br>
<br>
so by using this equation [1] you can calculate carrier lifetime<br>
<br>
[1]:K.P.Ong, D.J.Singh, P.Wu, Phys. Rev. B 83 (2011) 115110.<br>
<br>
carrier lifetime=2.53*(10^-5)*(T^-1)*(<wbr>n^(-1/3)) [1]<br>
<br>
were T:temperatur, n: carrier concentration.<br>
<br>
and if u want calculate mobility use this equation :<br>
<br>
mobility=conductivity/(charge elementaire*carrier concentration)<br>
<br>
i think if you have this parameters you can calculate diffusion length.<br>
<br>
<br>
<br>
<br>
<br>
<br>
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Message: 2<br>
Date: Sat, 18 Feb 2017 14:13:40 +0100<br>
From: Nicola Marzari <<a href="mailto:nicola.marzari@epfl.ch">nicola.marzari@epfl.ch</a>><br>
Subject: Re: [Pw_forum] carrier lifetime, diffusion length, mobility<br>
(HASSAN AHMOUM)<br>
To: PWSCF Forum <<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>>, "<a href="mailto:eariel99@gmail.com">eariel99@gmail.com</a>"<br>
<<a href="mailto:eariel99@gmail.com">eariel99@gmail.com</a>><br>
Message-ID: <<a href="mailto:7ee0eabc-9615-7521-a56b-de4586e8c9bc@epfl.ch">7ee0eabc-9615-7521-a56b-<wbr>de4586e8c9bc@epfl.ch</a>><br>
Content-Type: text/plain; charset=windows-1252; format=flowed<br>
<br>
On 18/02/2017 13:22, Abdullah N. Albarakati wrote:<br>
> Dear Eduardo Menendez,<br>
><br>
> Thank you very much,<br>
><br>
> so far, I follow your recommendation and I will feedback with my finding,<br>
><br>
> Best wishes,<br>
<br>
It would be best to start from reading 2016 arxiv review on electron-phonon<br>
interactions et al. by Giustino.<br>
<br>
It is, though, advanced material - but approximated models are<br>
of limited use.<br>
<br>
nicola<br>
<br>
--<br>
------------------------------<wbr>------------------------------<wbr>----------<br>
Prof Nicola Marzari, Chair of Theory and Simulation of Materials, EPFL<br>
Director, National Centre for Competence in Research NCCR MARVEL, EPFL<br>
<a href="http://theossrv1.epfl.ch/Main/Contact" rel="noreferrer" target="_blank">http://theossrv1.epfl.ch/Main/<wbr>Contact</a> <a href="http://nccr-marvel.ch/en/project" rel="noreferrer" target="_blank">http://nccr-marvel.ch/en/<wbr>project</a><br>
<br>
<br>
------------------------------<br>
<br>
Message: 3<br>
Date: Sat, 18 Feb 2017 14:28:06 +0100<br>
From: nicvok <<a href="mailto:nicvok@freenet.de">nicvok@freenet.de</a>><br>
Subject: Re: [Pw_forum] Silicon DOS issue - Pw_forum Digest, Vol 115,<br>
Issue 18<br>
To: <a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a><br>
Message-ID: <<a href="mailto:98B6E39E-62CF-4F75-8B54-E460E06B6D21@freenet.de">98B6E39E-62CF-4F75-8B54-<wbr>E460E06B6D21@freenet.de</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Dear Xufeng,<br>
<br>
from a first view your results seem reliable.<br>
Indeed you are right that for an isolated, k-isotropic band one would expect a sqrt(E) behaviour of the DOS near the band bottom (for perfect sampling and integration :D). I think if you are not to harsh with yourself, you can see this in your calculations for the first 80meV.<br>
Have in mind that depending on your calculation (LDA/GGA, strained etc..) a band folds in around 100-150meV above the CBM and changes the sqrt(E)-behaviour.<br>
Second the ?effective mass? is strictly speaking k-dependent as 1/m \propto del^2 E_{k} / del k^2 \propto del/del k v_{k}, as you can see in fig 3<br>
<br>
<a href="https://img2.picload.org/image/rowwrwir/1.png" rel="noreferrer" target="_blank">https://img2.picload.org/<wbr>image/rowwrwir/1.png</a> <<a href="https://img2.picload.org/image/rowwrwir/1.png" rel="noreferrer" target="_blank">https://img2.picload.org/<wbr>image/rowwrwir/1.png</a>><br>
<br>
where v_k is shown 100meV above the CBM. I used only a coarse mesh of ~4000k, but get similar results as you. Ignoring the oscillations, the dependence of DOS^2 is almost linear, too.<br>
<br>
So again, it depending on what you want to calculate afterwards, your results look pretty okay.<br>
<br>
bests,<br>
Nicki<br>
<br>
DTU Denmark, CAMd<br>
<br>
> Am 18.02.2017 um 12:00 schrieb <a href="mailto:pw_forum-request@pwscf.org">pw_forum-request@pwscf.org</a>:<br>
><br>
> Message: 3<br>
> Date: Fri, 17 Feb 2017 21:05:59 -0500<br>
> From: Xufeng Wang <<a href="mailto:wang159@purdue.edu">wang159@purdue.edu</a> <mailto:<a href="mailto:wang159@purdue.edu">wang159@purdue.edu</a>>><br>
> Subject: [Pw_forum] Silicon DOS issue<br>
> To: <a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a> <mailto:<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>><br>
> Message-ID:<br>
> <<a href="mailto:CAH5zo9%2Bvg-7TfvrM2hC%2B6n_AjtZBU7dXpfHythuiM_BoBAP2hA@mail.gmail.com">CAH5zo9+vg-7TfvrM2hC+6n_<wbr>AjtZBU7dXpfHythuiM_BoBAP2hA@<wbr>mail.gmail.com</a> <mailto:<a href="mailto:CAH5zo9%2Bvg-7TfvrM2hC%2B6n_AjtZBU7dXpfHythuiM_BoBAP2hA@mail.gmail.com">CAH5zo9+vg-7TfvrM2hC+<wbr>6n_AjtZBU7dXpfHythuiM_<wbr>BoBAP2hA@mail.gmail.com</a>>><br>
> Content-Type: text/plain; charset="utf-8"<br>
><br>
> Dear community,<br>
><br>
> I am unable to obtain the square root energy dependency of the bulk Silicon<br>
> conduction band DOS, despite using a fine k grid (100x100x100).<br>
><br>
> I expect the DOS near conduction band edge (below the second conduction<br>
> band of silicon) has a square root dependence with energy. I plotted out<br>
> the (DOS)^2 vs energy I obtained here: <a href="http://imgur.com/a/Wu07z" rel="noreferrer" target="_blank">http://imgur.com/a/Wu07z</a> <<a href="http://imgur.com/a/Wu07z" rel="noreferrer" target="_blank">http://imgur.com/a/Wu07z</a>><br>
><br>
> As you can see, (DOS)^2 vs. energy is not linear, meaning DOS is not having<br>
> a square root dependence with energy. Is this an known problem or am I<br>
> doing something wrong? Here is the nscf calculation input deck:<br>
><br>
> -------<br>
><br>
> &control<br>
><br>
> prefix='silicon',<br>
><br>
> pseudo_dir='../pseudo/'<br>
><br>
> outdir = './results',<br>
><br>
> tstress=.false.,<br>
><br>
> tprnfor=.false.,<br>
><br>
> calculation = 'nscf',<br>
><br>
> verbosity='high',<br>
><br>
> /<br>
><br>
> &system<br>
><br>
> ibrav= 2, celldm(1) =10.<a href="tel:2623466921" value="+12623466921">2623466921</a>, nat= 2, ntyp= 1,<br>
><br>
> ecutwfc = 30.0, ecutrho=300.0, input_dft='PBE', nbnd = 8,<br>
><br>
> /<br>
><br>
> &electrons<br>
><br>
> diagonalization = 'david',<br>
><br>
> conv_thr = 1d-08,<br>
><br>
> mixing_mode = 'plain',<br>
><br>
> mixing_beta = 0.7,<br>
><br>
> /<br>
><br>
> ATOMIC_SPECIES<br>
><br>
> Si 28.086 Si.pbe-n-rrkjus_psl.0.1.UPF<br>
><br>
> ATOMIC_POSITIONS<br>
><br>
> Si 0.00 0.00 0.00<br>
><br>
> Si 0.25 0.25 0.25<br>
><br>
> K_POINTS automatic<br>
><br>
> 100 100 100 0 0 0<br>
> -------<br>
><br>
> Thanks!<br>
><br>
> Xufeng<br>
<br>
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<br>
Message: 4<br>
Date: Sat, 18 Feb 2017 10:47:40 -0500<br>
From: Manu Hegde <<a href="mailto:mhegde@uwaterloo.ca">mhegde@uwaterloo.ca</a>><br>
Subject: [Pw_forum] Units in Vc-relax<br>
To: pw_forum <<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>><br>
Message-ID:<br>
<CA+g44Duf4U=u=<a href="mailto:w2wu7Zm0aHWpYcWSF7P1K%2BQeJ5tYe7pKBaZxg@mail.gmail.com">w2wu7Zm0aHWpYcW<wbr>SF7P1K+QeJ5tYe7pKBaZxg@mail.<wbr>gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Hello All,<br>
<br>
I have performed some vc-relax calculations at the end I am getting,<br>
<br>
(criteria: energy < 1.0E-04, force < 1.0E-03, cell < 5.0E-01)<br>
<br>
What are the units of above quantities?. Hope I will get some answer.<br>
<br>
Thanks and Regards,<br>
Manu<br>
<br>
(University of Waterloo)<br>
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Message: 5<br>
Date: Sat, 18 Feb 2017 17:04:13 +0100<br>
From: stefano de gironcoli <<a href="mailto:degironc@sissa.it">degironc@sissa.it</a>><br>
Subject: Re: [Pw_forum] Units in Vc-relax<br>
To: PWSCF Forum <<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>><br>
Message-ID: <<a href="mailto:8bcdfee4-b5b3-976d-00a1-2e52639a3be3@sissa.it">8bcdfee4-b5b3-976d-00a1-<wbr>2e52639a3be3@sissa.it</a>><br>
Content-Type: text/plain; charset="windows-1252"<br>
<br>
On 18/02/2017 16:47, Manu Hegde wrote:<br>
> Hello All,<br>
><br>
> I have performed some vc-relax calculations at the end I am getting,<br>
><br>
> (criteria: energy < 1.0E-04, force < 1.0E-03, cell < 5.0E-01)<br>
ryd , ryd/a.u., kbar<br>
<br>
HTH<br>
<br>
stefano<br>
><br>
> What are the units of above quantities?. Hope I will get some answer.<br>
><br>
> Thanks and Regards,<br>
> Manu<br>
><br>
> (University of Waterloo)<br>
><br>
><br>
> ______________________________<wbr>_________________<br>
> Pw_forum mailing list<br>
> <a href="mailto:Pw_forum@pwscf.org">Pw_forum@pwscf.org</a><br>
> <a href="http://pwscf.org/mailman/listinfo/pw_forum" rel="noreferrer" target="_blank">http://pwscf.org/mailman/<wbr>listinfo/pw_forum</a><br>
<br>
<br>
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Message: 6<br>
Date: Sat, 18 Feb 2017 21:36:40 -0500<br>
From: Manu Hegde <<a href="mailto:mhegde@uwaterloo.ca">mhegde@uwaterloo.ca</a>><br>
Subject: Re: [Pw_forum] Units in Vc-relax<br>
To: PWSCF Forum <<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>><br>
Message-ID:<br>
<<a href="mailto:CA%2Bg44DvKU-MBF9KrNVZC0ScWV%2B3_imi%2Bep60_ymKCEo3gGZ%2B%2BA@mail.gmail.com">CA+g44DvKU-MBF9KrNVZC0ScWV+3_<wbr>imi+ep60_ymKCEo3gGZ++A@mail.<wbr>gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Thank you!<br>
<br>
On Sat, Feb 18, 2017 at 11:04 AM, stefano de gironcoli <<a href="mailto:degironc@sissa.it">degironc@sissa.it</a>><br>
wrote:<br>
<br>
> On 18/02/2017 16:47, Manu Hegde wrote:<br>
><br>
> Hello All,<br>
><br>
> I have performed some vc-relax calculations at the end I am getting,<br>
><br>
> (criteria: energy < 1.0E-04, force < 1.0E-03, cell < 5.0E-01)<br>
><br>
> ryd , ryd/a.u., kbar<br>
><br>
> HTH<br>
><br>
> stefano<br>
><br>
><br>
> What are the units of above quantities?. Hope I will get some answer.<br>
><br>
> Thanks and Regards,<br>
> Manu<br>
><br>
> (University of Waterloo)<br>
><br>
><br>
> ______________________________<wbr>_________________<br>
> Pw_forum mailing listPw_forum@pwscf.orghttp://<a href="http://pwscf.org/mailman/listinfo/pw_forum" rel="noreferrer" target="_blank">p<wbr>wscf.org/mailman/listinfo/pw_<wbr>forum</a><br>
><br>
><br>
><br>
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> Pw_forum mailing list<br>
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Message: 7<br>
Date: Sun, 19 Feb 2017 07:00:40 +0000<br>
From: Christoph Wolf(??????) <<a href="mailto:chwolf@postech.ac.kr">chwolf@postech.ac.kr</a>><br>
Subject: [Pw_forum] upcoming workshops, summer schools and how to find<br>
them?<br>
To: "<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>" <<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>><br>
Message-ID:<br>
<<a href="mailto:PS1PR0401MB1977C6651C06522A9F11DD248E5F0@PS1PR0401MB1977.apcprd04.prod.outlook.com">PS1PR0401MB1977C6651C06522A9F<wbr>11DD248E5F0@PS1PR0401MB1977.<wbr>apcprd04.prod.outlook.com</a>><br>
<br>
Content-Type: text/plain; charset="ks_c_5601-1987"<br>
<br>
Dear all!<br>
<br>
I apologize for this slightly off-topic question. I was wondering if anyone is aware of upcoming workshops or summer schools in the Asian region? I have seen that the QE homepage lists pasts workshops with links to the materials but I was unable to find upcoming workshops. My self-teaching has only brought me so far and I would love to attend one in the near future!<br>
<br>
Sorry again for the non-technical question and have a great Sunday!<br>
<br>
Chris<br>
<br>
<br>
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End of Pw_forum Digest, Vol 115, Issue 19<br>
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