Non-Abelian gauge enhances self-healing for non-Hermitian Su-Schrieffer-Heeger chain

作者：Yazhuang Miao, Yiming Zhao, Yong Wang, Jie Qiao, Xiaolong Zhao, Yi Xue-Xi · 发表于：Physical Review A · 年份：2025 · DOI：10.1103/148x-k5xd · 被引用次数：4 · 研究领域：Quantum Mechanics and Non-Hermitian Physics、Topological Materials and Phenomena、Nonlinear Photonic Systems

We investigate a non-Hermitian extension of the Su-Schrieffer-Heeger model that incorporates spin-dependent SU(2) gauge fields, represented by non-Abelian couplings between lattice sites, as well as independent nonreciprocal hopping amplitudes. This framework gives rise to a rich phase structure characterized by complex-energy braiding and tunable non-Hermitian skin effects. By employing the generalized Brillouin zone approach, we analyze the bulk-boundary correspondence and identify topological transitions protected by chiral symmetry. Notably, we demonstrate that non-Abelian gauge fields significantly enhance the dynamical resilience of the system, enabling robust self-healing under a moving scattering potential. These results clarify the role of SU(2) gauge fields in stabilizing non-Hermitian topological phases and indicate that the proposed model can be realized with currently available photonic, atomic, and superconducting experimental platforms.