Tutorials:Parameters
From ALPS
The following input parameters are common to most of the ALPS applications
Contents
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 |
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 |