For the massive Thirring model with arbitrary Dirichlet boundary fields, the boundary bound states and the SPT/trivial phase structure are solved exactly, and the stability window shrinks with increasing repulsive interactions.
The nature of our solution crucially depends on the sign of the bare fermion mass parameterm 0
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Interplay between Symmetry Breaking and Interactions in a Symmetry Protected Topological Phase
For the massive Thirring model with arbitrary Dirichlet boundary fields, the boundary bound states and the SPT/trivial phase structure are solved exactly, and the stability window shrinks with increasing repulsive interactions.