An analytic continuation method builds Bethe-Salpeter spectra in selected energy ranges from polarizability tensors sampled at a few complex frequencies via matrix-valued continued fractions.
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Efficient analytic continuation approach to Bethe-Salpeter excitation spectra in selected energy windows
An analytic continuation method builds Bethe-Salpeter spectra in selected energy ranges from polarizability tensors sampled at a few complex frequencies via matrix-valued continued fractions.