kwant.plotter.current(syst, current, relwidth=0.05, **kwargs)[source]¶Show an interpolated current defined for the hoppings of a system.
The system graph together with current intensities defines a “discrete” current density field where the current density is non-zero only on the straight lines that connect sites that are coupled by a hopping term.
To make this scalar field easier to visualize and interpret at different
length scales, it is smoothed by convoluting it with the bell-shaped bump
function f(r) = max(1 - (2*r / width)**2, 0)**2. The bump width is
determined by the relwidth parameter.
This routine samples the smoothed field on a regular (square or cubic) grid and displays it using an enhanced variant of matplotlib’s streamplot.
This is a convenience function that is equivalent to
streamplot(*interpolate_current(syst, current, relwidth), **kwargs).
The longer form makes it possible to tweak additional options of
interpolate_current.
syst (kwant.system.FiniteSystem) – The system for which to plot the current.
current (sequence of float) – Sequence of values defining currents on each hopping of the system.
Ordered in the same way as syst.graph. This typically will be
the result of evaluating a Current operator.
relwidth (float or None) – Relative width of the bumps used to smooth the field, as a fraction of the length of the longest side of the bounding box.
**kwargs (various) – Keyword args to be passed verbatim to kwant.plotter.streamplot.
fig – A figure with the output if ax is not set, else None.
matplotlib figure
See also