Hi,


> I want to plot the band structure for my system, i.e. a quantum dot. I
> am still confused as to what code I need to write to plot that, or
> whether sys.leads[0] is actually correct for what I need.

Calculating a band structure for a quantum dot is not mathematically
well-defined.
A quantum dot does not have translational symmetry, so momentum is not a
good quantum number. You cannot label the eigenstates of your
Hamiltonian with a unique momentum 'k', so plotting the associated
eigenvalues as a function of 'k' (i.e. the band structure) is not possible.

Even if you attach leads to your quantum dot you'll still have the same
problem. While the leads *individually* have translational symmetry, the
combination of leads and quantum dot does not, because the quantum dot
breaks the translational symmetry.


Given this, it is difficult for us to interpret what you mean when you
say you want to plot "the band structure for your system". If you
provide more context for what your end goal is, we may be able to help more.

Happy Kwanting,

Joe