DMRG For Antiferromagnetic spin one half chain
Hi Dears Thanks a lot. I have achieved the ground state energy as follow: SWEEP=8, L=30,MAXSTATES=100, E0= -0.437045191. SWEEP=8, L=50,MAXSTATES=140, E0= -0.43944220. SWEEP=4, L=100,MAXSTATES=100, E0= -0.44127739. SWEEP=4, L=100,MAXSTATES=300, E0= -0.44127739. SWEEP=4, L=300,MAXSTATES=100, E0= -0.44127739. The E0= -0.44127739 is the best enegy that i achieve and when i change the sweep&M&L,the energy doesn't change.I can't improve the result ,also i wrote the model & lattice, but have not changed any thing. Thanks. On Fri, Dec 5, 2008 at 6:00 AM, <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) 3. Re: DMRG For Antiferromagnetic Spin one half chain (Adrian E. Feiguin)
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Message: 1 Date: Thu, 4 Dec 2008 22:35:51 +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: <89e5d6760812041105w5556998du756af1c79c8fb32b@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1"
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)
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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
4 sweeps seems far too little to me. Can you try with 50. Adrian, what would you recommend? Matthias On 6 Dec 2008, at 13:58, zhian asadzadeh wrote:
Hi Dears Thanks a lot. I have achieved the ground state energy as follow: SWEEP=8, L=30,MAXSTATES=100, E0= -0.437045191. SWEEP=8, L=50,MAXSTATES=140, E0= -0.43944220. SWEEP=4, L=100,MAXSTATES=100, E0= -0.44127739. SWEEP=4, L=100,MAXSTATES=300, E0= -0.44127739. SWEEP=4, L=300,MAXSTATES=100, E0= -0.44127739. The E0= -0.44127739 is the best enegy that i achieve and when i change the sweep&M&L,the energy doesn't change.I can't improve the result ,also i wrote the model & lattice, but have not changed any thing. Thanks.
On Fri, Dec 5, 2008 at 6:00 AM, <comp-phys-alps-users-request@phys.ethz.ch
wrote: Send Comp-phys-alps-users mailing list submissions to comp-phys-alps-users@phys.ethz.ch
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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) 3. Re: DMRG For Antiferromagnetic Spin one half chain (Adrian E. Feiguin)
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Message: 1 Date: Thu, 4 Dec 2008 22:35:51 +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: <89e5d6760812041105w5556998du756af1c79c8fb32b@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1"
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:
Send Comp-phys-alps-users mailing list submissions to comp-phys-alps-users@phys.ethz.ch
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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)
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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
Dear Zhian, You values for L=100 are correct, but the value for L=300 is not. I am getting -0.4422.. for L=200 The energy steadily goes down as you increase the system size, and if you do a finite size scaling, it should converge to the exact value. The convergence is slow for open boundary conditions. You can try with periodic to see what you get (you'll need to keep more states, though) Usually, 8 full sweeps (left to right, right to left) are enough. If you see that the energy keeps changing as you sweep, then you may need to do more sweeps. I think 4 to 8 full sweeps should be fine for the spin=1/2 chain. Saludos, <ADRIAN> Matthias Troyer wrote:
4 sweeps seems far too little to me. Can you try with 50. Adrian, what would you recommend?
Matthias
On 6 Dec 2008, at 13:58, zhian asadzadeh wrote:
Hi Dears Thanks a lot. I have achieved the ground state energy as follow: SWEEP=8, L=30,MAXSTATES=100, E0= -0.437045191. SWEEP=8, L=50,MAXSTATES=140, E0= -0.43944220. SWEEP=4, L=100,MAXSTATES=100, E0= -0.44127739. SWEEP=4, L=100,MAXSTATES=300, E0= -0.44127739. SWEEP=4, L=300,MAXSTATES=100, E0= -0.44127739. The E0= -0.44127739 is the best enegy that i achieve and when i change the sweep&M&L,the energy doesn't change.I can't improve the result ,also i wrote the model & lattice, but have not changed any thing. Thanks.
On Fri, Dec 5, 2008 at 6:00 AM, <comp-phys-alps-users-request@phys.ethz.ch <mailto: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) 3. Re: DMRG For Antiferromagnetic Spin one half chain (Adrian E. Feiguin)
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Message: 1 Date: Thu, 4 Dec 2008 22:35:51 +0330 From: "zhian asadzadeh" <zhian.asadzadeh@gmail.com <mailto:zhian.asadzadeh@gmail.com>> Subject: [ALPS-users] DMRG For Antiferromagnetic Spin one half chain To: comp-phys-alps-users@phys.ethz.ch <mailto:comp-phys-alps-users@phys.ethz.ch> Message-ID:
<89e5d6760812041105w5556998du756af1c79c8fb32b@mail.gmail.com <mailto:89e5d6760812041105w5556998du756af1c79c8fb32b@mail.gmail.com>> Content-Type: text/plain; charset="iso-8859-1"
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 <mailto:comp-phys-alps-users-request@phys.ethz.ch>>wrote:
> Send Comp-phys-alps-users mailing list submissions to > comp-phys-alps-users@phys.ethz.ch <mailto:comp-phys-alps-users@phys.ethz.ch> > > To subscribe or unsubscribe via the World Wide Web, visit > https://webmail.phys.ethz.ch/mailman/listinfo/comp-phys-alps-users > or, via email, send a message with subject or body 'help' to > comp-phys-alps-users-request@phys.ethz.ch <mailto:comp-phys-alps-users-request@phys.ethz.ch> > > You can reach the person managing the list at > comp-phys-alps-users-owner@phys.ethz.ch <mailto:comp-phys-alps-users-owner@phys.ethz.ch> > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Comp-phys-alps-users digest..." > > > 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 <mailto:zhian.asadzadeh@gmail.com>> > Subject: [ALPS-users] DMRG for antiferromagnetic spin one half chain > To: comp-phys-alps-users@phys.ethz.ch <mailto:comp-phys-alps-users@phys.ethz.ch> > Message-ID: > <89e5d6760812020513q686feb0bge51a267945421f2@mail.gmail.com <mailto: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 >
participants (3)
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Adrian E. Feiguin
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Matthias Troyer
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zhian asadzadeh