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(a)phys.ethz.ch
>Reply-To: comp-phys-alps-users(a)phys.ethz.ch
>To: comp-phys-alps-users(a)phys.ethz.ch
>Subject: Comp-phys-alps-users Digest, Vol 12, Issue 2
>Date: Wed, 28 Mar 2007 12:00:02 +0200
>
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> 1. Re: Classical MC Heisenberg help (Matthias Troyer)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Tue, 27 Mar 2007 17:23:54 +0200
>From: Matthias Troyer <troyer(a)phys.ethz.ch>
>Subject: Re: [ALPS-users] Classical MC Heisenberg help
>To: comp-phys-alps-users(a)phys.ethz.ch
>Message-ID: <531DC60A-E501-4263-ACD0-ECD3FF56F0CB(a)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
> >
> > _________________________________________________________________
> > Solve the Conspiracy and win fantastic prizes. http://
> > www.theconspiracygame.co.uk/
>
>
>
>End of Comp-phys-alps-users Digest, Vol 12, Issue 2
>***************************************************
_________________________________________________________________
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Hi Aniket,
The answer is simple: add a line like
S=2
to the parameters. However there should generally be no need, since
the value of S can just be absorbed into the coupling constant.
Best regards
Matthias
On 29 Mar 2007, at 20:50, aniket(a)jncasr.ac.in wrote:
> Respected sir,
> I am new user of ALPS. So can I ask you one query?
>
> How change the value of S in 1D Heisenberg model?
>
> Hamiltonian for 1D Heisenberg model
>
> H = sum (S(i)*S(j))
>
> description
>
> here H is the Hamiltonian
>
> sum means summation over all i & j.
>
> S(i) and S(j) means i & j th spin.
>
> by default S value is 1 for classical CONVENTION.
> how change this value (other than 1)?
>
> I am running alps-application/tutorial/classical2/parm2a file.
>
> ( for convenience I am attaching URL also
> http://alps.comp-phys.org:16080/mediawiki-1.9.3/index.php/
> Tutorial:ClassicalMCSimulations#The_one-dimensional_Heisenberg_chain )
>
> I am waiting for your reply.
>
> Regards,
> Aniket
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
_________________________________________________________________
Solve the Conspiracy and win fantastic prizes.
http://www.theconspiracygame.co.uk/