Hey,

I have been trying to set up a 1D quantum wire and then calculate the
conductance. However when trying to calculate the smatrix it gives me the
following error:

ValueError: Input needs to be a square matrix.

And my system that I am working with is defined as follows: lat =
kwant.lattice.chain(a)

How can I possibly resolve this problem? Or where should I be looking to
get an idea?

Sincerely,
Binayyak

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