2 papers
cond-mat.stat-mech2026
A Simple Necessary and Sufficient Condition for Yang--Baxter Integrability
Mizuki Sanatani, Naoto Shiraishi, Fuga Ishii
Quantum integrability is a cornerstone of the exact theory of interacting quantum spin chains. In its standard formulation, however, one starts from R-matrices satisfying the Yang-…
cond-mat.stat-mech2026
Proof of the absence of local conserved quantities in the Holstein model
Fuga Ishii, Mizuki Yamaguchi
Absence of local conserved quantities, or \textit{nonintegrability}, is often assumed when discussing various phenomena in quantum many-body systems, such as thermalization and tra…