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.
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In the 1D Fermi-Hubbard model with opposing spin-dependent linear potentials, the ground state shows three regimes with a staircase-like reduction in bound pairs as the gradient increases, enabling integer-level control of pairing.
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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.
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Ground state of the Hubbard model with spin-dependent linear potential
In the 1D Fermi-Hubbard model with opposing spin-dependent linear potentials, the ground state shows three regimes with a staircase-like reduction in bound pairs as the gradient increases, enabling integer-level control of pairing.