Topological enhancement of nonnormality in non-Hermitian skin effects
Yusuke O. Nakai, Nobuyuki Ōkuma, Daichi Nakamura, Kenji Shimomura, Masatoshi Sato
Abstract
This paper introduces scalar measures that adequately characterize the non-Hermitian skin effects under open boundary condition. Using these measures, the authors reveal that the topological properties of the non-Hermitian skin effect give a macroscopic enhancement of non-normality under open boundary condition. The topological enhancement of non-normality governs the perturbation sensitivity of the spectra and the anomalous time-evolution dynamics intrinsic to non-Hermiticity. They also show that these measures correctly describe the disorder-induced topological phase transitions of the skin effect.
Topics & Concepts
NormalityHermitian matrixSkin effectScalar (mathematics)Boundary value problemPerturbation (astronomy)Boundary (topology)MathematicsPhysicsTopology (electrical circuits)Mathematical analysisPure mathematicsGeometryQuantum mechanicsStatisticsCombinatoricsQuantum Mechanics and Non-Hermitian PhysicsQuantum chaos and dynamical systemsTopological Materials and Phenomena