MC heisenberg follow up/ lattices - Comp-phys-alps-users

30 Mar 2007

      Hi,
Thanks for the reply. I would also like to know if the anisotropy can be 
varied throughout the lattice, i.e. different values for different sites, or 
is only one value throughout the whole lattice allowed?
Additionally I would like some points regarding the lattice definitions to 
be confirmed.
1. The edge type 0,1,2 corresponds to bond type J0, J1 ,J2 parameters? Edge 
type default = 0?
2. The edge offset is in units of 'basis vectors' specified in the <BASIS> 
tags? Default = 0 0 0? Allowing both -ve and +ve numbers?
Thanks,
David Miller
...
From: comp-phys-alps-users-request@phys.ethz.ch
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Subject: Comp-phys-alps-users Digest, Vol 12, Issue 2
Date: Wed, 28 Mar 2007 12:00:02 +0200
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Today's Topics:

Re: Classical MC Heisenberg help (Matthias Troyer)

Message: 1
Date: Tue, 27 Mar 2007 17:23:54 +0200
From: Matthias Troyer troyer@phys.ethz.ch
Subject: Re: [ALPS-users] Classical MC Heisenberg help
To: comp-phys-alps-users@phys.ethz.ch
Message-ID: 531DC60A-E501-4263-ACD0-ECD3FF56F0CB@phys.ethz.ch
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
It should work by specifying the parameter
D="0 0 1"
The three components are Dx, Dy and Dz. Please be aware however that
in that case only local updates can be used.
Matthias
On Mar 27, 2007, at 1:30 AM, David Miller wrote:
...
Dear all,
I am doing classical MC simulations using the Heisenberg model with
Alps-1.3b2. I would like to include an easy axis/plane anisotropy
in the Heisenberg Hamiltonian of the form (-/+)D*sum_i((Sz_i)^2),
how would I acheive this?
Thanks,
David Miller

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End of Comp-phys-alps-users Digest, Vol 12, Issue 2

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