SKIN effectTHEORY of wave motionPHASES of matterBRILLOUIN zonesPHYSICSNon-Hermitian physics has emerged as a new paradigm that profoundly changes our understanding of non-equilibrium systems, introducing novel concepts such as exceptional points, spectral topology, and non-Hermitian skin effects (NHSEs)...
where V is the covariance matrix of the error term ϵ(f) and the superscript “H” denotes the Hermitian conjugate. Partial directed coherence (πij(f)) is calculated as follows: $${\pi }_{i\leftarrow j}(f)=\frac{\frac{1}{{\delta }_{i}^{2}}| {\overline{A}}_{ij}(f){...
Non-Hermitian models describe the physics of ubiquitous open systems with gain and loss. One intriguing aspect of non-Hermitian models is their inherent topology that can produce intriguing boundary phenomena like resilient higher-order topological insulators (HOTIs) and non-Hermitian skin effects (...