Fate of exceptional points under interactions: Reduction of topological classifications

T Yoshida, Y Hatsugai - Physical Review B, 2023 - APS
Despite recent extensive studies of the non-Hermitian topology, understanding interaction
effects is left as a crucial question. In this paper, we address interaction effects on …

Reduction of one-dimensional non-Hermitian point-gap topology by interactions

T Yoshida, Y Hatsugai - Physical Review B, 2022 - APS
In spite of extensive works on non-Hermitian topology, interaction effects remain crucial
questions. We analyze correlated non-Hermitian systems with special emphasis on the one …

Correlation effects on non-Hermitian point-gap topology in zero dimension: Reduction of topological classification

T Yoshida, Y Hatsugai - Physical Review B, 2021 - APS
We analyze a zero-dimensional correlated system with special emphasis on the non-
Hermitian point-gap topology protected by chiral symmetry. Our analysis elucidates that …

Defective edge states and number-anomalous bulk-boundary correspondence in non-Hermitian topological systems

XR Wang, CX Guo, SP Kou - Physical Review B, 2020 - APS
Non-Hermitian topological systems exhibit properties very different from those of their
Hermitian counterparts. An important puzzling issue for non-Hermitian topological systems is …

Emerging exceptional point with breakdown of the skin effect in non-Hermitian systems

S Jana, L Sirota - Physical Review B, 2023 - APS
We study the interplay of two distinct non-Hermitian parameters: directional coupling and on-
site gain and loss, together with topology, in coupled one-dimensional non-Hermitian Su …

Topological classification for intersection singularities of exceptional surfaces in pseudo-Hermitian systems

H Jia, RY Zhang, J Hu, Y Xiao, S Zhang, Y Zhu… - Communications …, 2023 - nature.com
Non-Hermitian systems are known for their intriguing topological properties, which underpin
various exotic physical phenomena. Exceptional points, in particular, play a pivotal role in …

Topological correspondence between hermitian and non-hermitian systems: Anomalous dynamics

JY Lee, J Ahn, H Zhou, A Vishwanath - Physical review letters, 2019 - APS
The hallmark of symmetry-protected topological phases is the existence of anomalous
boundary states, which can only be realized with the corresponding bulk system. In this …

Detecting bulk and edge exceptional points in non-Hermitian systems through generalized Petermann factors

YY Zou, Y Zhou, LM Chen, P Ye - Frontiers of Physics, 2024 - Springer
Non-orthogonality in non-Hermitian quantum systems gives rise to tremendous exotic
quantum phenomena, which can be fundamentally traced back to non-unitarity. In this …

Braiding topology of symmetry-protected degeneracy points in non-Hermitian systems

JZ Li, K Bai, C Guo, TR Liu, L Fang, D Wan, M Xiao - Physical Review B, 2024 - APS
Degeneracy points in non-Hermitian systems are of great interest. While a homotopic
framework exists for understanding their behavior in the absence of symmetry, it does not …

Periodic table for topological bands with non-Hermitian symmetries

H Zhou, JY Lee - Physical Review B, 2019 - APS
Classifications of symmetry-protected topological (SPT) phases provide a framework to
systematically understand the physical properties and potential applications of topological …