Hi Dear

Thanks for your consideration.I run the program for different sizes and have increased it to 500 sites.For up to 100 site the result converges but it is  not the result that should it be (0.443147),the result  that have achieved earlier from Bethe method and in the work of Mr.white that tests the DMRG for showing the powerful of this code.

Thanks

zhian

On Wed, Dec 3, 2008 at 2:30 PM, <comp-phys-alps-users-request@phys.ethz.ch> wrote:

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Today's Topics:

  1. DMRG for antiferromagnetic spin one half chain (zhian asadzadeh)
  2. Re: DMRG for antiferromagnetic spin one half chain
     (Matthias Troyer)


----------------------------------------------------------------------

Message: 1
Date: Tue, 2 Dec 2008 16:43:12 +0330
From: "zhian asadzadeh" <zhian.asadzadeh@gmail.com>
Subject: [ALPS-users] DMRG for antiferromagnetic spin one half chain
To: comp-phys-alps-users@phys.ethz.ch
Message-ID:
       <89e5d6760812020513q686feb0bge51a267945421f2@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi ADRIAN
I run DMRG program for  antiferromagnetic S=1/2 chain,but the result that i
achieve for groun state energy  doesn't concur with the result  that has
achieved from bethe ansats method (0.443147).
I have changed m&sweep& number of sites(to 1000 site) but my result just 2
digit concur with 0.443147.
I don't know what must i do.
I will be very appreciate  if you can guide me.

Thanks
zhian
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Message: 2
Date: Tue, 2 Dec 2008 08:33:57 -0500
From: Matthias Troyer <troyer@phys.ethz.ch>
Subject: Re: [ALPS-users] DMRG for antiferromagnetic spin one half
       chain
To: comp-phys-alps-users@phys.ethz.ch
Message-ID: <67427F34-DE94-4D41-A49C-A3BC801E4BA7@phys.ethz.ch>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

What is the system size? There are finite size corrections. As you
increase the size it should converge

Matthias

On Dec 2, 2008, at 8:13 AM, zhian asadzadeh wrote:

> Hi ADRIAN
> I run DMRG program for  antiferromagnetic S=1/2 chain,but the result
> that i achieve for groun state energy  doesn't concur with the
> result  that has achieved from bethe ansats method (0.443147).
> I have changed m&sweep& number of sites(to 1000 site) but my result
> just 2 digit concur with 0.443147.
> I don't know what must i do.
> I will be very appreciate  if you can guide me.
>
> Thanks
> zhian



End of Comp-phys-alps-users Digest, Vol 33, Issue 1
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