Hi Derek,

> The code to plot the wave function is:
> wf = kwant.wave_function(sys,energy=0)(0)
> rho = kwant.operator.Density(sys)
> density = rho(wf)
> kwant.plotter.density(sys, density)
>
> When I do print(np.shape(wf)) I get (0, 300); where 300 is the number of 
> sites in this example lattice. Thus it seems like the wave function 
> information might be contained in the returned object, but I am not sure how 
> to access it. Please let me know if you have any idea on what I am doing 
> incorrectly here

The size of the first axis of 'wf' is zero because there are no
propagating modes originating from lead #0 at energy 0 in your system.
Try plotting the band structure of lead #0 with:

    kwant.plotter.bands(sys.leads[0])

to see at what energies the lead supports propagating modes.


Happy Kwanting,


Joe

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