[ALPS-users] Question about iDMRG in ALPS

[Axel Gagge]

Thank you. My idea was to use it to find critical exponents of my models though finite entanglement/bond dimension scaling at the quantum critical point, but I can find ways around it as you do in the paper...


Many thanks,

Axel


________________________________
Från: Comp-phys-alps-users <comp-phys-alps-users-bounces at lists.phys.ethz.ch> för Michele Dolfi <dolfim at phys.ethz.ch>
Skickat: den 18 januari 2017 20:38
Till: comp-phys-alps-users at lists.phys.ethz.ch
Ämne: Re: [ALPS-users] Question about iDMRG in ALPS

As a side note.
We recently published a new version of the dmrg codes which are more flexible and faster.
http://dx.doi.org/10.1016/j.cpc.2014.08.019


Best,
Michele

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ETH Zurich
Dr. Michele Dolfi
Institute for Theoretical Physics
HIT G 32.4
Wolfgang-Pauli-Str. 27
8093 Zurich
Switzerland

dolfim at phys.ethz.ch<mailto:dolfim at phys.ethz.ch>
www.itp.phys.ethz.ch<http://www.itp.phys.ethz.ch>

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On 18 Jan 2017, at 20:35, Michele Dolfi <dolfim at phys.ethz.ch<mailto:dolfim at phys.ethz.ch>> wrote:

Dear Axel,

Infinite systems are not supported in the current ALPS applications.

However some people in our group worked on infinite algorithm based on ALPS.

For example high temperature series expansion as well as perturbative series expansion by Andreas Hehn.
http://dx.doi.org/10.1016/j.cpc.2016.09.003

For infinite MPS there is also some work by Juan Osorio.


Best regards,
Michele

--
ETH Zurich
Dr. Michele Dolfi
Institute for Theoretical Physics
HIT G 32.4
Wolfgang-Pauli-Str. 27
8093 Zurich
Switzerland

dolfim at phys.ethz.ch<mailto:dolfim at phys.ethz.ch>
www.itp.phys.ethz.ch<http://www.itp.phys.ethz.ch/>

+41 44 633 78 56 phone
+41 44 633 11 15 fax

On 18 Jan 2017, at 18:16, Axel Gagge <axel.gagge at fysik.su.se<mailto:axel.gagge at fysik.su.se>> wrote:


I have tried out using DMRG with an infinite lattice. I could not find any information about how to do infinite DMRG so I just assumed that I could define an infinite lattice graph and work with that.... However when I try this I get the error: "bad lexical cast: source type value could not be interpreted as target". This was for a 1d lattice graph of one site with one unit cell and the spin model. I have included the files I used along with this email just in case...

Is this the correct way to approach this or is there any other way to get out iDMRG calculations??

Best
/Axel
PhD Student
Stockholm University
<my_models.xml><my_lattices.xml><Test of iDMRG.ipynb>

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