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.chwrote:
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Today's Topics:
- Re: Energy Gap (Matthias Troyer)
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
Can you be more concrete please otherwise we cannot help:
- what are the inputs you use (we need the complete input files!) - what is the number you compare to (again we need the exact reference and number)
Matthias
On 17 Mar 2009, at 04:13, zhian asadzadeh wrote:
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 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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