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quant-ph2026
Isospectrality and Operator Complexity
Pradip Kattel, Yicheng Tang, Natan Andrei
We study a pair of exactly solvable, isospectral fermion chains, one strongly interacting and one quadratic, that nevertheless display remarkably different phase structures and ope…
quant-ph2025
Exact solution of a non-Hermitian -symmetric Heisenberg spin chain
Pradip Kattel, Parameshwar R. Pasnoori, Natan Andrei
We construct the exact solution of a non-Hermitian -symmetric isotropic Heisenberg spin chain with integrable boundary fields. We find that the system exhibits two ty…