<div dir="ltr"><div><div>Dear Prof. Cantele, and Prof. Chibisov<br><br></div>I have incorporated the changes suggested by you, However the problem persists.<br><br></div>please suggest. I will really appreciate a lot, if you can edit and verify the above code. <br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 30, 2016 at 12:48 PM, Shan <span dir="ltr"><<a href="mailto:ecebhushan@gmail.com" target="_blank">ecebhushan@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Dear Prof. Chibisov,<br><br></div>Thank you very much for your reply.<br><br></div>I am pleased to have your reply. I know you for the last 2 years, as I work under Dr. Anurag Srivastava. Sure, I will convey your greetings to him.<br><br></div>Thank you again for your reply.<br><br></div>B. S. Bhushan<div><div class="h5"><br><div><div><div><div><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 29, 2016 at 7:49 PM, Andrey Chibisov <span dir="ltr"><<a href="mailto:andreichibisov@yandex.ru" target="_blank">andreichibisov@yandex.ru</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear B.S. Bhushan,<br>
I see you're from Gwalior. I know this institution. <br>
Unless, of course I was not mistaken. Give please greetings to Dr. Anurag Srivastava.<br>
And now, with regard to the graphene.<br>
1. The structure must be relaxing.<br>
2. Add the nbnd parameter (with empty state), to watch the band gap.<br>
3. In the graphene there is a spin-orbit interaction. Use the options:<br>
noncolin, lspinorb, starting_magnetization and Fully-Relativistic Pseudo to get a good value bandgap.<br>
<br>
So, I hope it will help.<br>
<br>
29.11.2016, 22:03, "Shan" <<a href="mailto:ecebhushan@gmail.com" target="_blank">ecebhushan@gmail.com</a>>:<br>
<div><div class="m_1582933410774301714h5">> Dear Experts,<br>
><br>
> I am beginner of QE. As part of the practice, I am extracting the basic structural and electronic properties of simple semiconducting materials, 1D and 2D structures. Things were fine untill i tried graphene. However, I stuck with graphene band structure for the last 3 days. As a beginner, I have done everything i can to resolve the problem. when i try to plot the band structure of 2 atom graphene, either i get a wrong band gap or an empty plot.<br>
><br>
> Here I am attaching the SCF code and Bandstructure code. Can someone please verify and tell me where the problem is.<br>
><br>
> SCF code:-<br>
><br>
> &CONTROL<br>
> calculation='scf',<br>
> outdir='.',<br>
> prefix='pwscf',<br>
> pseudo_dir='.',<br>
> verbosity='low',<br>
> tprnfor=.true.,<br>
> tstress=.true.,<br>
> /<br>
><br>
> &SYSTEM<br>
> ibrav=4,<br>
> celldm(1)=4.6509939378d0, celldm(3)=4.536666,<br>
> nat=2,<br>
> ntyp=1,<br>
> ecutwfc=30,<br>
> ecutrho=120,<br>
> input_dft='pbe',<br>
> occupations='smearing',<br>
> smearing='mv',<br>
> degauss=0.005d0,<br>
> /<br>
><br>
> &ELECTRONS<br>
> conv_thr=1d-08,<br>
> mixing_beta=0.7d0,<br>
> /<br>
><br>
> ATOMIC_SPECIES<br>
> C 12.010700d0 C.pbe-n-rrkjus_psl.0.1.UPF<br>
><br>
> ATOMIC_POSITIONS {crystal}<br>
> C 0.0000000000d0 0.0000000000d0 0.0000000000d0<br>
> C 0.3333333333d0 0.6666666667d0 0.0000000000d0<br>
><br>
> K_POINTS {automatic}<br>
> 22 22 1 0 0 0<br>
><br>
> Band Structure code:-<br>
><br>
> &CONTROL<br>
> calculation='bands',<br>
> outdir='.',<br>
> prefix='pwscf',<br>
> pseudo_dir='.',<br>
> verbosity='high',<br>
> /<br>
><br>
> &SYSTEM<br>
> ibrav=4,<br>
> celldm(1)=4.6509939378d0, celldm(3)=4.536666,<br>
> nat=2,<br>
> ntyp=1,<br>
> ecutwfc=30,<br>
> ecutrho=120,<br>
> input_dft='pbe',<br>
> occupations='smearing',<br>
> smearing='mv',<br>
> degauss=0.005d0,<br>
> /<br>
><br>
> &ELECTRONS<br>
> conv_thr=1d-08,<br>
> mixing_beta=0.7d0,<br>
> /<br>
><br>
> ATOMIC_SPECIES<br>
> C 12.010700d0 C.pbe-n-rrkjus_psl.0.1.UPF<br>
><br>
> ATOMIC_POSITIONS {crystal}<br>
> C 0.0000000000d0 0.0000000000d0 0.0000000000d0<br>
> C 0.3333333333d0 0.6666666667d0 0.0000000000d0<br>
><br>
> K_POINTS {crystal_b}<br>
> 5<br>
> 0.000 0.0 0.16666667 10 ! A<br>
> 0.000 0.000 0.0 20 ! G<br>
> 0.33333333 0.57735027 0.0 20 ! K<br>
> 0.33333333 0.0 0.0 20 ! M<br>
> 0.0 0.0 0.0 0 ! G<br>
><br>
> Thank you very much in advance,<br>
><br>
> Regards,<br>
> B S Bhushan<br>
> Ph.D Scholar<br>
> Indian Institute of Information Technology and Management, Gwalior,<br>
> India.<br>
><br>
</div></div>> ,<br>
<span>><br>
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<br>
-- <br>
</span>Best regards,<br>
Andrey Chibisov. Ph.D.<br>
Numerical method of mathematical physics Laboratory,<br>
Computational Center, Russian Academy of Sciences.<br>
Khabarovsk, Russia<br>
Web page: <a href="https://www.researchgate.net/profile/A_Chibisov" rel="noreferrer" target="_blank">https://www.researchgate<wbr>.net/profile/A_Chibisov</a><br>
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