Hi Matthias,

Don't worry, I believe the problem has been solved. It looks like a problem with the parameters I was using. Thanks for your help anyway!

All the best, Kristina

On 3 June 2015 at 16:08, Kristina Fidanovski 21292685@student.uwa.edu.au wrote:

Hi Matthias,

I've been using python scripts such as:

import pyalps import matplotlib.pyplot as plt import pyalps.plot

#prepare the input parameters parms = [] for t in [ 0.02, 0.04, 0.06, 0.1]:

parms.append(
    {
      'LATTICE'        : "honeycomb lattice",
      'MODEL'          : "boson Hubbard",
      'T'              : 0.1,
      'L'              : 24 ,
      't'              : t ,
      'mu'             : 0.75,
      'U'              : 1.0,
      'NONLOCAL'       : 0 ,
      'Nmax'           : 2 ,
      'THERMALIZATION' : 10000,
      'SWEEPS'         : 500000
    }
)

#write the input file and run the simulation input_file = pyalps.writeInputFiles('parm5a',parms) res = pyalps.runApplication('worm',input_file,Tmin=5)

#load the magnetization and collect it as function of field h data = pyalps.loadMeasurements(pyalps.getResultFiles(prefix='parm5a'),'Stiffness') rhos = pyalps.collectXY(data,x='t',y='Stiffness')

#make plot plt.figure() pyalps.plot.plot(rhos) plt.xlabel('Hopping $t/U$') plt.ylabel('Superfluid density $\rho _s$') plt.show()

With various combinations of parameters and the inclusion of V (in the hopes of at least reproducing results obtained in other studies).

Kind Regards, Kristina

On 3 June 2015 at 15:16, Matthias Troyer troyer@phys.ethz.ch wrote:

...

Hi Kristina,

what code are you using and what are your input files? We cannot help without that information.

Matthias Troyer

...

On Jun 2, 2015, at 21:07, Kristina Fidanovski <

21292685@student.uwa.edu.au> wrote:

...

Dear Developers,

I'm trying to look into the extended boson Hubbard model on a honeycomb

lattice, but no matter what I do the density always comes out as zero. I don't seem to have the same problem when using a honeycomb lattice with any of the other examples in the tutorials. What could be the problem?

...

All the best, Kristina