syst : kwant.system.FiniteSystem or callable
If a function, then it must take named parameters and return the
Hamiltonian as a dense matrix.
x : pair (name, values)
Parameter to ham that will be varied. Consists of the
parameter name, and a sequence of parameter values.
y : pair (name, values), optional
Used for 3D plots (same as x). If provided, then the cartesian
product of the x values and these values will be used as a grid
over which to evaluate the spectrum.
params : dict, optional
The rest of the parameters to ham, which will be kept constant.
mask : callable, optional
Takes the parameters specified by x and y and returns True
if the spectrum should not be calculated for the given parameter
values.
file : string or file object or None
The output file. If None, output will be shown instead.
show : bool
Whether matplotlib.pyplot.show() is to be called, and the output is
to be shown immediately. Defaults to True.
dpi : float
Number of pixels per inch. If not set the matplotlib default is
used.
fig_size : tuple
Figure size (width, height) in inches. If not set, the default
matplotlib value is used.
ax : matplotlib.axes.Axes instance or None
If ax is not None, no new figure is created, but the plot is done
within the existing Axes ax. in this case, file, show, dpi
and fig_size are ignored.
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