A monic GCD of Laurent polynomial coefficients from det(λI - H_B(z)) identifies exact flat-band energies and their multiplicities in finite-range tight-binding models.
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A polynomial GCD certificate for exact flat bands in finite-range Bloch Hamiltonians
A monic GCD of Laurent polynomial coefficients from det(λI - H_B(z)) identifies exact flat-band energies and their multiplicities in finite-range tight-binding models.