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Date: Fri, Oct 17, 2008 at 1:30 PM
Subject: Comp-phys-alps-users Digest, Vol 31, Issue 5
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Today's Topics:

  1. Re: Comp-phys-alps-users Digest, Vol 31, Issue 4 (zhian asadzadeh)


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Message: 1
Date: Thu, 16 Oct 2008 04:17:31 -0700
From: "zhian asadzadeh" <zhian.asadzadeh@gmail.com>
Subject: Re: [ALPS-users] Comp-phys-alps-users Digest, Vol 31, Issue 4
To: comp-phys-alps-users@phys.ethz.ch
Message-ID:
       <89e5d6760810160417u754c084ap20b050269ac89b13@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Dear All
I used Sz_total=N(S1-S2),as an input parameter but this thing just speed up
the calculation and it doesn't any effect on the output,means that with this
input parameter i have result that it doesn't differ with the result that
earlier i have got.i want to achieve the results that earlier are achieved
in the following paper,
*(SK Pati, S Ramasesha, D Sen - Physical Review B, 1997 - APS)*
they study the ferrimagnetic chain and present the ground state energy and
some correlations.
they consider N cell that each cell consist of two spin(s1,s2).
 Hamiltonian is  H=sum_i (S2_i . S1_i+1)+(S1_i.S2_i -1)
i counts the cells and it is form 0 to N.
the results that i achieve,two digite concur with theirs results.
I don't  know what must  i do that i have a better results.

Thanks

On Wed, Oct 15, 2008 at 3:00 AM,
<comp-phys-alps-users-request@phys.ethz.ch>wrote:

> Send Comp-phys-alps-users mailing list submissions to
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> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Comp-phys-alps-users digest..."
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>
> Today's Topics:
>
>   1. Ferrimagnet (zhian asadzadeh)
>   2. Re: Ferrimagnet (Adrian E. Feiguin)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 14 Oct 2008 19:02:01 +0330
> From: "zhian asadzadeh" <zhian.asadzadeh@gmail.com>
> Subject: [ALPS-users] Ferrimagnet
> To: Comp-phys-alps-users@phys.ethz.ch
> Message-ID:
>        <89e5d6760810140832p1dec90d9h3dfb0cab0d2367ee@mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear All
>
> I'm making my first experiments with Alps...
> I want to use DMRG for ferrimagnetic chain,but i have some problems.
> First,in the dmrg steps because the chain don't have the symmetry between
> left and right halves,the density matrices for these two halves should be
> constructed at every iteration of the calculation.
> Second,I think that it isn't exist spin parity symmetry.
> How i can do these?
>
> Thanks in advance
>
> zhian
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> ------------------------------
>
> Message: 2
> Date: Tue, 14 Oct 2008 15:16:53 -0700
> From: "Adrian E. Feiguin" <afeiguin@kitp.ucsb.edu>
> Subject: Re: [ALPS-users] Ferrimagnet
> To: comp-phys-alps-users@phys.ethz.ch
> Message-ID: <48F51A55.7080902@kitp.ucsb.edu>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Dear Zhian
>
> >
> > I'm making my first experiments with Alps...
> > I want to use DMRG for ferrimagnetic chain,but i have some problems.
>
> > First,in the dmrg steps because the chain don't have the symmetry
> > between left and right halves,the density matrices for these two
> > halves should be constructed at every iteration of the calculation.
>
> This is not quite right. You can use DMRG in disordered systems if you
> wish. Try it out as it is.
>
> > Second,I think that it isn't exist spin parity symmetry.
>
> Sztot is a well defined quantum number in ferrimagnetic spin chains. You
> can determine the value for the ground state and use it as an input
> parameter.
>
> I hope this helps.
> If you have further questions, it would be very helpful if you could
> direct us to a paper with the Hamiltonian written explicitly
>
> Saludos,
> <ADRIAN>
>
>
> End of Comp-phys-alps-users Digest, Vol 31, Issue 4
> ***************************************************
>
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