The script ZeroPoints.py plots the energy spectra for the Hamiltonian of two coupled SSH chains:
as a function of the hoppings v/t on a 2xN ladder with open boundary condition.
For more information about the system see the article:
Li, C., Lin, S., Zhang, G., & Song, Z. (2017). Topological nodal points in two coupled Su-Schrieffer-Heeger chains. Physical Review B, 96(12), 125418.
For running the script you need Python3 and the packages numpy, sympy and matplotlib. Take a look at the script to know how to run the program.