Hamiltonian construction

Anton Akhmerovrequested to merge
hamiltonian_construction into main

This does several things:

  • Switches the Hamiltonian format of builder_to_tb to dense because we expect no speedup due to needing full spectrum.
  • Prohibits Kwant lattices without norbs set (the code used to assume 1 orbital, but this is not what norbs=None means).
  • Avoids \mathcal{O}(N^2) or \mathcal{O}(N^3) operations for constructing the Hamiltonian, and therefore likely providing a speedup.

I did not modify the tests, and therefore I don't know whether they are specific enough.

Edited by Anton Akhmerov

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