Spectral localizer for line-gapped non-Hermitian systems
Short-ranged and line-gapped non-Hermitian Hamiltonians have strong topological invariants given by an index of an associated Fredholm operator. It is shown how these invariants can be accessed via the signature of a suitable spectral localizer. Here, this numerical technique is implemented in an example with relevance to the design of topological photonic systems, such as topological lasers.
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗