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quant-ph2026
Scale-Free Response with Directional Amplification in Critical Non-Hermitian Systems
Kunling Zhou, Zihe Yang, Bowen Zeng +1
The non-Hermitian skin effect can lead to directional amplification of response, with the associated end-to-end Green's function generally exhibiting size dependence. Any deviation…
cond-mat.stat-mech2026
Hidden Twisted Sectors and Exponential Degeneracy in Root-of-Unity XXZ Heisenberg Chains
Yongao Hu, Felix Gerken, Thore Posske
Recently, product states have been identified as simple-structured eigenstates of XXZ Heisenberg spin models in arbitrary dimensions, occurring at anisotropy values corresponding t…