Re: [ALPS-users] Comp-phys-alps-users Digest, Vol 18, Issue 8 - Comp-phys-alps-users

20 Sep 2007

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Today's Topics:

Re: models in classical monte carlo simulation (Matthias Troyer)
Re: one question about custom measurement (Matthias Troyer)

Message: 1
Date: Wed, 19 Sep 2007 19:41:41 +0200
From: Matthias Troyer troyer@phys.ethz.ch
Subject: Re: [ALPS-users] models in classical monte carlo simulation
To: comp-phys-alps-users@phys.ethz.ch
Message-ID: 7E292C25-4D1A-4234-82E4-BF3733ED4046@phys.ethz.ch
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Hi Gang,
The classical models cannot be as easily coded in an input file as  
the discrete quantum models. We have support for classical O(N)  
vector spin models with anisotropic interactions hardcoded. Which  
model do you have in mind?
Matthias
On 19 Sep 2007, at 06:16, GANG CHEN wrote:
Thanks, the model is O(3) Heisenberg model with Dzyaloshinskii-Moriya 
anisotropy. e.g. if there are two bonds in the unit cell, each bond has 
different Dzyaloshinskii-Moriya vector, is it possible to deal with 
model? What will be the name for it in the hardcoded library?
Gang
...
...
Hi all,
What is the default libary for the model in classical monte carlo  
simulation? In the tutorial there are Heisenberg model and Ising  
model which could not be found in the file lib/xml/models.xml.  
Could I define my own models as usual way? And do I refer the model  
libary in the parameter file also in the same way as  
sparsediagonalization?
Thanks,
Gang
<chggst.vcf>

Message: 2
Date: Wed, 19 Sep 2007 19:42:04 +0200
From: Matthias Troyer troyer@phys.ethz.ch
Subject: Re: [ALPS-users] one question about custom measurement
To: comp-phys-alps-users@phys.ethz.ch
Message-ID: DDDC6596-1617-436A-A232-A5E7FAB77BE9@phys.ethz.ch
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
You will need to code those yourself manually. We do not support such  
multi-site measurements yet, but will in a future version.
Matthias
On 19 Sep 2007, at 02:02, GANG CHEN wrote:
...
Hi all,
I am working on a lattice which has several sites in one unit cell.  
Let's denote site index as "i, j ,k", unit cell index as "A, B, C".  
If I want to see the behavior of  some particular site in the unit  
cell, e.g. S_{A, i}; or some other local information, such as Cross 
[S_{A, i}, S_{A,j}] \dot S_{A, k}, i,j,k are three given sites in  
one unit cell, how do I define them?
Thanks,
Gang
<chggst.vcf>
End of Comp-phys-alps-users Digest, Vol 18, Issue 8