3.1. kwant – Top level package#

For convenience, short names are provided for a few widely used objects from the sub-packages. Otherwise, this package has only very limited functionality of its own.

Generic functionality#

kwant.__version__ = '1.5.0'[source]#

The version of Kwant is available under the name __version__.

This string respects PEP 440 and has the following format

  • Released version: ‘1.3.0’, ‘1.3.1’, etc.

  • Alpha version: ‘1.2.0a0’, ‘1.2.0a1’, etc.

  • Beta version: ‘1.1.0b0’, ‘1.1.0b1’, etc.

  • Development version (derived from git describe --first-parent --dirty): ‘1.3.2.dev27+gdecf6893’, ‘1.1.1.dev10+gabcd012.dirty’, etc.

  • Development version with incomplete information: ‘unknown’, ‘unknown+g0123abc’, etc.


Class of warnings about a deprecated feature of Kwant.


Class for errors that occur in user-provided code.

From kwant.builder#

Builder([symmetry, conservation_law, ...])

A tight binding system defined on a graph.

HoppingKind(delta, family_a[, family_b])

A pattern for matching hoppings.

From kwant.lattice#


A translational symmetry defined in real space.

From kwant.plotter#

plot(sys[, num_lead_cells, unit, ...])

Plot a system in 2 or 3 dimensions.

From kwant.solvers.default#

greens_function(sys[, energy, args, ...])

Compute the retarded Green's function of the system between its leads.

ldos(sys[, energy, args, check_hermiticity, ...])

Calculate the local density of states of a system at a given energy.

smatrix(sys[, energy, args, out_leads, ...])

Compute the scattering matrix of a system.

wave_function(sys[, energy, args, ...])

Return a callable object for the computation of the wave function inside the scattering region.