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cond-mat.str-el2026
Exact solutions of hidden free fermion models
Mingchen Zheng, Balázs Pozsgay, Shu Chen
Hidden-free-fermion (HFF) Hamiltonians exhibit free-fermion spectra despite lacking an explicit quadratic representation, yet their algebraic provenance and periodic-boundary behav…
math-ph2026
Bethe-root configurations and spectral degeneracy in the open XXZ chain with degenerate boundaries
Shizhang Wu, Shu Chen, Junpeng Cao +1
We investigate the structure of Bethe-root configurations in the spin-1/2 XXZ chain with degenerate open boundaries. The physical solutions of the Bethe Ansatz equations are classi…