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Today's Topics:

1. Re: models in classical monte carlo simulation (Matthias Troyer) 2. Re: one question about custom measurement (Matthias Troyer)

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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>

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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 ***************************************************