Hi Dear,

Thank you for your consideration.
My model is anisotropic Ferrimagnetic chain in transverse magnetic field. when I say the result is wrong I mean when I have tried to obtain energy gap for some problems and models which have been solved earlier I saw  the result doesn't agree with those earlier results. for example spin one and half-one chain and ferrimagnetic chain and  anisotropic ferrimagnetic ladder.
Something is not very obvius for me, how DMRG calculate ground state and first exited state from one wave function ?!

Thanks,
Zhian.


On Tue, Mar 17, 2009 at 2:30 PM, <comp-phys-alps-users-request@phys.ethz.ch> wrote:
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Today's Topics:

  1. Re: Energy Gap (Matthias Troyer)


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Message: 1
Date: Mon, 16 Mar 2009 12:33:11 -0700
From: Matthias Troyer <troyer@phys.ethz.ch>
Subject: Re: [ALPS-users] Energy Gap
To: comp-phys-alps-users@phys.ethz.ch
Message-ID: <43E825E5-7BE3-4EA0-9C2A-20A1FC8C21AF@phys.ethz.ch>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes


On Mar 16, 2009, at 2:01 AM, zhian asadzadeh wrote:

> Hi All,
>
> I want to calculate energy gap for spin chain with DMRG. I set
> NUM_EIGENVALUES=2 in my parm file but the result which  achieved is
> wrong.
> Is it necessary to determine something else for example the sector
> which DMRG work in it? in my problem I dont have any good symmetry
> and I can not easily determine the sector which the first exited
> state is in it. I would be very appreciate if someone could please
> help me.
>
> Thanks,
> Zhian.

Can you please send more details about your model, or better yet the
input file? An what do you mean exactly by saying that the result is
wrong?

Matthias



End of Comp-phys-alps-users Digest, Vol 36, Issue 10
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