In the quadratic resonant level model, Lanczos coefficients of impurity operators can be tuned to arbitrary growth patterns via coupling choice, showing they do not reliably indicate integrability or chaos.
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Resonant level model from a Krylov perspective: Lanczos coefficients in a quadratic model
In the quadratic resonant level model, Lanczos coefficients of impurity operators can be tuned to arbitrary growth patterns via coupling choice, showing they do not reliably indicate integrability or chaos.