3.1. Usage of tenes_simpleΒΆ

tenes_simple is a tool that creates an input file of tenes_std for predefined models and lattices.

$ tenes_simple simple.toml

  • Takes a file as an argument

  • Output an input file for tenes_std

  • Command line options are as follows

    • --help

      • Show help message

    • --version

      • Show version number

    • --output=filename

      • Specify the output file name filename

      • Default is std.toml

      • File name cannot be the same as the input file name

    • --coordinatefile=coordfile

      • Specify the output coordinate file name coordfile

      • Default is coordinates.dat

      • In a coordinate file, the first, second, and third columns denote site index, x coordinate, and y coordinate (in Cartesian), respectively.

    • --use-site-hamiltonian

      • Onsite terms in Hamiltonian like Zeeman term will be output as site Hamiltonians

      • If not specified, these terms will be absorbed into the nearest neighbor bond Hamiltonians

The currently defined models and lattices are as follows:

  • Model

    • Spin system

  • Lattice

    • Square lattice

    • Triangular lattice

    • Honeycomb lattice

    • Kagome lattice

See Input file for tenes_simple for details of the input file. Below, a sample file for the S=1/2 Heisenberg model on the square lattice is shown.

[lattice]
type = "square lattice" # type of lattice
L = 2                   # size of unitcell
W = 2                   # size of unitcell
virtual_dim = 3         # bond dimension
initial = "antiferro"   # initial state

[model]
type = "spin" # type of model
J = 1.0       # Heisenberg interaction

[parameter]
[parameter.general]
is_real = true # use real tensor

[parameter.simple_update]
num_step = 1000  # number of steps
tau = 0.01       # imaginary time step

[parameter.full_update]
num_step = 0    # number of steps
tau = 0.01      # imaginary time step

[parameter.ctm]
dimension = 9       # bond dimension