Closed-form zero-energy two- and three-magnon eigenstates of the alternating Heisenberg chain are derived from a generalized Bethe ansatz, explaining exact degeneracy counts for even and odd lengths.
(49) Plugging in the symmetry adapted GBA from Eq
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Exact generalized Bethe eigenstates of the non-integrable alternating Heisenberg chain
Closed-form zero-energy two- and three-magnon eigenstates of the alternating Heisenberg chain are derived from a generalized Bethe ansatz, explaining exact degeneracy counts for even and odd lengths.