2025/11/19 by Crampé, Nicolas, Labriet, Quentin, Morey, Lucia +2 · 1 citation
Mathematics · Physics and Astronomy · #Mathematical functions and polynomials #Quantum Mechanics and Non-Hermitian Physics #Algebraic structures and combinatorial models
paper · doi:10.48550/arxiv.2511.15527
We analyze Su-Schrieffer-Heeger (SSH) models using the doubling method for orthogonal polynomial sequences. This approach yields the analytical spectrum and exact eigenstates of the models. We demonstrate that the standard SSH model is associated with the doubling of Chebyshev polynomials. Extending this technique to the doubling of other finite sequences enables the construction of Hamiltonians for inhomogeneous SSH models which are exactly solvable. We detail the specific cases associated with Krawtchouk and q-Racah polynomials. This work highlights the utility of polynomial-doubling techniques in obtaining exact solutions for physical models.