The site basis excitation ansatz computes accurate one-magnon dispersions for the S=1 Heisenberg chain by constructing a small non-orthogonal basis from a single-site-like diagonalization and solving small matrices for each momentum.
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Site Basis Excitation Ansatz for Matrix Product States
The site basis excitation ansatz computes accurate one-magnon dispersions for the S=1 Heisenberg chain by constructing a small non-orthogonal basis from a single-site-like diagonalization and solving small matrices for each momentum.