Difference between revisions of "Tutorials:Parameters"

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(Parameters for Monte Carlo simulations)
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||Number of Monte Carlo sweeps for
||Number of Monte Carlo sweeps for thermalization

Revision as of 02:37, 1 March 2007

The following input parameters are common to most of the ALPS applications

Parameters for Monte Carlo simulations

Parameter Default Meaning
SEED 0 The random number seed used in the next run. After using a seed in the creation of a Monte Carlo run, this value gets incremented by one.
WORK_FACTOR 1 A factor by which the work that needs to be done for a simulation is multiplied in load balancing.
SWEEPS number of Monte Carlo steps (after thermalization)
THERMALIZATION Number of Monte Carlo sweeps for thermalization

Lattice defintion

ALPS applications on lattices specify the lattice with the following three parameters

Parameter Default Meaning
LATTICE_LIBRARY lattices.xml path to a file containing lattice descriptions
LATTICE name of the lattice, specified by dimensionality, extent and unit cell.
GRAPH as an alternative to a lattice, also a specific arbitrary graph defined in the lattice library can be specified.

In addition, the lattice description can require further parameters (e.g. L or W) as specified in the lattice description file.

Model defintion

ALPS quantum lattice models can be specified using the following parameters

Parameter Default Meaning
MODEL_LIBRARY models.xml path to a file containing model descriptions</td>
MODEL name of the model (for example "spin" or "boson")

The model description can also require further parameters (e.g. S=1/2 or S=1, h=0.5 for spin models, t=1.5 or mu=0.5 for boson models) as specified in the model description file.

Parameters for finite temperature simulations

Parameter Meaning
T the temperature
BETA inverse of temperature (if

temperature is not given