Two new families of inhomogeneous XY spin chains are constructed whose spectra and eigenvectors follow exactly from the B2-contiguity relations of q-Racah polynomials.
Zur theorie des ferromagnetismus,
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Exactly solvable inhomogeneous XY spin chain
Two new families of inhomogeneous XY spin chains are constructed whose spectra and eigenvectors follow exactly from the B2-contiguity relations of q-Racah polynomials.