Dear Synge

   Thank you very much for your email. I am using ALPS 2.0. It will be great if you can briefly tell me how to modify the code in order to calculate the magnetization density for my model. Also will it be possible to measure the correlation of the first component of magnetization for this model? Many appreciations!

Thanks,
Kubila


--- On Tue, 2/8/11, Kubila <kubila@yahoo.com> wrote:

From: Kubila <kubila@yahoo.com>
Subject: Re: [ALPS-users] quantum XY model with an uniform magnetic field in the x-direction
To: comp-phys-alps-users@lists.phys.ethz.ch
Date: Tuesday, February 8, 2011, 1:18 PM

Hi all

   It looks like that one can simulate this model with ferromagnetic coupling (the message returned saying that the model has a negative sign if one uses antiferromagnetic coupling). I would like to study magnetization density as a function of external field using loop (since dirloop_sse says that the dirloop_sse for simulating the model is not implemented). Somehow non of the observables look reasonable.... So which observable should I look into in order to study the external field dependence of magnetization density. Thanks.



--- On Thu, 1/13/11, Kubila <kubila@yahoo.com> wrote:

From: Kubila <kubila@yahoo.com>
Subject: Re: [ALPS-users] quantum XY model with an uniform magnetic field in the x-direction
To: comp-phys-alps-users@lists.phys.ethz.ch
Date: Thursday, January 13, 2011, 5:26 AM

Hi Prof. Troyer

   With antiferromagnetic couplings.



  

--- On Thu, 1/13/11, Matthias Troyer <troyer@phys.ethz.ch> wrote:

From: Matthias Troyer <troyer@phys.ethz.ch>
Subject: Re: [ALPS-users] quantum XY model with an uniform magnetic field in the x-direction
To: comp-phys-alps-users@lists.phys.ethz.ch
Date: Thursday, January 13, 2011, 2:44 AM

With ferromagnetic or antiferromagnetic couplings?

On Jan 13, 2011, at 11:33 AM, Kubila wrote:

Hi ALPS users

   I was wondering can one use looper to simulate quantum XY model with an uniform magnetic field in the x-direction. Thanks.