[Wien] spin texture?

[Yundi Quan]

I do not know much about topological insulator. Maybe I'm wrong.

Yundi


On Sat, Oct 1, 2011 at 1:27 AM, Gerhard Fecher <fecher at uni-mainz.de> wrote:

> I guess you have some misconcept about  spin, spin magnetic moments,
> magnetic moments, spin polarisation etc..
>
> There is no non-colinear magnetic moment in topological insulators
>
> What you have to calculate is the expectation value
> P=<Psi|Sigma|Psi*>/<Psi|Psi*>  the for the Px, Py, Pz components of the
> spinpolarisation vector
> where Sigma are the Pauli spin matrices
> (consult the textbook "Polarized Electrons" by J. Kessler, Springer)
>
> Ciao
> Gerhard
>
> ====================================
> Dr. Gerhard H. Fecher
> Institut of Inorganic and Analytical Chemistry
> Johannes Gutenberg - University
> 55099 Mainz
> ________________________________________
> Von: wien-bounces at zeus.theochem.tuwien.ac.at [
> wien-bounces at zeus.theochem.tuwien.ac.at]&quot; im Auftrag von &quot;Ruben
> Weht [ruweht at cnea.gov.ar]
> Gesendet: Freitag, 30. September 2011 23:49
> Bis: A Mailing list for WIEN2k users
> Betreff: Re: [Wien] spin texture?
>
> Dear Yundi,
>
> Thanks for your reply.
>
> Well, really I do not know, that is part of
> my doubts....
>
> The spin texture is in reciprocal space.
> How can I manage that in real space?
>
>   Ruben
>
> > Since the spin of the system changes like a spiral. The magnetic
> > moment is
> > non-collinear. The quantization axis changes. So it is necessary to
> > do a
> > non-collinear  calculation.
> >
> > Yundi
> >
> > On Fri, Sep 30, 2011 at 1:24 PM, Ruben Weht <ruweht at cnea.gov.ar>
> > wrote:
> >
> >> Dear Wien users,
> >>
> >> I am trying to reproduce some papers regarding the
> >> electronic structure of topological insulators
> >> and system with an important Rashba interaction
> >> (for instance BiTeI, Bi2Se3, etc).
> >>
> >> On many of them people calculate the electronic band
> >> structure (on a slab for a topological insulator
> >> or in bulk for a Rashba system) and showed what
> >> is called "spin texture", a non-collinear spin
> >> arrangement along the resulting Fermi surface
> >> (most of the time near a Dirac cone).
> >> Almost all of those papers said that the electronic
> >> structure was calculated using Wien2k.
> >>
> >> In general those system have a very strong
> >> spin-orbit coupling so, naively, I thought that
> >> spins up and down were completely mixed.
> >>
> >> Does anyone know how to calculate/plot that
> >> property?
> >> Do I have to use the non-collinear code, Wienncm?.
> >>
> >> Thanks a lot for your help,
> >>
> >>   Ruben
> >>
> >> *===============================================*
> >> |  Ruben Weht                                   |
> >> |  Departmento de Fisica - CNEA                 |
> >> |  Avda. General Paz y Constituyentes           |
> >> |  1650 - San Martin - ARGENTINA                |
> >> |  Email:  ruweht at cnea.gov.ar                   |
> >> |  Tel: (54-11) 6772-7104                       |
> >> |  Fax: (54-11) 6772-7121                       |
> >> *===============================================*
> >>
> >> _______________________________________________
> >> Wien mailing list
> >> Wien at zeus.theochem.tuwien.ac.at
> >> http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
> >>
> > _______________________________________________
> > Wien mailing list
> > Wien at zeus.theochem.tuwien.ac.at
> > http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
> >
>
>
> *===============================================*
> |  Ruben Weht                                   |
> |  Departmento de Fisica - CNEA                 |
> |  Avda. General Paz y Constituyentes           |
> |  1650 - San Martin - ARGENTINA                |
> |  Email:  ruweht at cnea.gov.ar                   |
> |  Tel: (54-11) 6772-7104                       |
> |  Fax: (54-11) 6772-7121                       |
> *===============================================*
>
> _______________________________________________
> Wien mailing list
> Wien at zeus.theochem.tuwien.ac.at
> http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
> _______________________________________________
> Wien mailing list
> Wien at zeus.theochem.tuwien.ac.at
> http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://zeus.theochem.tuwien.ac.at/pipermail/wien/attachments/20111001/d7b276ab/attachment.htm>