[Pw_forum] Fw: Re: Re: Re: Raman for graphene

Haibei Huang haibeih at student.unimelb.edu.au
Mon Oct 27 23:44:36 CET 2014


Dear plgong,

Actually QE can only calculate non-resonant Raman spectra in non-metal
materials as said above.

However, for the case of semi-metal graphene, there is a way to get the
Raman intensity.

1). Edit your scf input file:

a. DO NOT use any metal related parameters in &SYSTEM section; (e.g.
occupations='smearing', degauss=....)

b. Change the psudopotentials to a NON-ultrasoft one in ATOMIC_SPECIES
section;

2). Edit your phonon input file:

a. Add 'epsil=.ture.', 'Iraman=.ture.' and 'trans=.true.' in &INPUTPH
section;

Then you could run pw.x and ph.x , and utilize the matdyn file to obtain
Raman intensity. (I assume you know how to do it.)

Good luck!
Haibei
Dept. of Chemistry
University of Melbourne

On Mon, Oct 27, 2014 at 9:53 PM, plgong <plgong at theory.issp.ac.cn> wrote:

> Dear professor,
>      Recently, I read a paper  about calculated Raman spectra with the QE.
> I
> have connected to the authors but no reply for many days. I feel it strang
> because of
> no implement of Raman for metal (like graphene) in QE, and do not
> understand how they
> do it and get the intensity.
>     The link of this paper is "http://www.ncbi.nlm.nih.gov/pubmed/18154315
> ".
>     If you have free time, please reply soon.
>
>
> Truely
> PL Gong
>
>
> > -----原始邮件-----
> > 发件人: plgong <plgong at theory.issp.ac.cn>
> > 发送时间: 2014年10月27日 星期一
> > 收件人: "PWSCF Forum" <pw_forum at pwscf.org>
> > 抄送:
> > 主题: Re: Re: [Pw_forum] Raman for graphene
> >
> > Dear professor,
> >      Thanks for your quick reply. I will read papers you provided and
> understand further development
> > of Raman based on theoretical calculation. Also, I hope new methods can
> be added to solve the hard
> > simulation to this kind of important tools with the help of pwscf
> enthusiast.
> >
> >  Best wishes
> >  PL Gong
> >
> >
> >
> >
> > > -----原始邮件-----
> > > 发件人: "Nicola Marzari" <nicola.marzari at epfl.ch>
> > > 发送时间: 2014年10月26日 星期日
> > > 收件人: "Ari Paavo Seitsonen" <Ari.P.Seitsonen at iki.fi>, "PWSCF Forum" <
> pw_forum at pwscf.org>
> > > 抄送:
> > > 主题: Re: [Pw_forum] Raman for graphene
> > >
> > > On 25/10/2014 23:16, Ari P Seitsonen wrote:
> > > >
> > > > Dear PL Gong,
> > > >
> > > >    Sometimes the things are not that simple to be programmed and
> > > > provided to others - please try to learn about the difference between
> > > > non-resonant and resonant Raman.
> > > >
> > > >    You can also have a look at the papers of Michele Lazzeri and
> > > > Francesco Mauri,
> > >
> > >
> > > E.g these for the temperature dependence of the Raman modes
> > >
> > > http://journals.aps.org/prb/pdf/10.1103/PhysRevB.68.220509
> > > http://journals.aps.org/prl/pdf/10.1103/PhysRevLett.99.176802
> > > http://journals.aps.org/prb/pdf/10.1103/PhysRevB.86.121404
> > >
> > > Not sure what is published re the shapes - a few groups are/were
> > > working on this.
> > >
> > >                             nicola
> > >
> > > ----------------------------------------------------------------------
> > > Prof Nicola Marzari, Chair of Theory and Simulation of Materials, EPFL
> > > _______________________________________________
> > > Pw_forum mailing list
> > > Pw_forum at pwscf.org
> > > http://pwscf.org/mailman/listinfo/pw_forum
> >
> >
> >
> > --
> >
> > ====================================================
> > Addr: Institute of Solid State Physics, Chinese Academy of
> > Sciences, Hefei, Anhui 230031, China
> > Tel: +86-551-65591591(office), 18756086113(cell phone)
> > Email: plgong at theory.issp.ac.cn
> > ========================================================================
> >
> >
> >
> >
>
>
>
> --
>
> ====================================================
> Addr: Institute of Solid State Physics, Chinese Academy of
> Sciences, Hefei, Anhui 230031, China
> Tel: +86-551-65591591(office), 18756086113(cell phone)
> Email: plgong at theory.issp.ac.cn
> ========================================================================
>
>
>
>
>
>
>
> --
>
> ====================================================
> Addr: Institute of Solid State Physics, Chinese Academy of
> Sciences, Hefei, Anhui 230031, China
> Tel: +86-551-65591591(office), 18756086113(cell phone)
> Email: plgong at theory.issp.ac.cn
> ========================================================================
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