An alternative open boundary condition in the Ising chain maps the system to two Kitaev chains, switching the topological degeneracy due to gauge dependence of the SSH winding number.
Sachdev,Quantum phase transitions(Cambridge uni- versity press, 2011)
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Boundary-dependent topological degeneracy in an Ising chain
An alternative open boundary condition in the Ising chain maps the system to two Kitaev chains, switching the topological degeneracy due to gauge dependence of the SSH winding number.